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Wig-Wag and Linework Primer: The Zig-Zag Pattern in Boro Pipemaking

Wig-wag linework explained: what the zig-zag pattern is, building the boro cane layup, the switchback pull, keeping lines crisp, and the honest practice curve.

cluster · published

By Glass Torches Editorial · Updated

Wig-Wag and Linework Primer: The Zig-Zag Pattern in Boro Pipemaking

Short answer: A wig-wag is a linework pattern from the borosilicate pipemaking tradition: parallel lines of colored cane are laid up on clear glass, then pulled and reversed so the lines zig-zag back and forth instead of running straight. You build a striped cane layup, heat it, and perform a switchback pull, reversing direction at each pass so the stripes fold into a chevron or spiral pattern, then work that patterned glass into tubing or a finished piece. It is one of the signature looks of American boro pipemaking, and it is honestly an advanced technique: the layup, the pull, and the heat control each take real practice, and instructors generally want you solid on hollow work and stringer control first.

If you are still getting comfortable manipulating boro tube at all, start with working boro tubing basics and come back. This primer covers what wig-wag is, how the process works conceptually, and what learning it takes.

What a wig-wag is (and how it differs from plain linework and reversal)

Linework is the umbrella term: decorating clear borosilicate with deliberate lines of colored glass, whether those lines run straight, spiral, or zig-zag. The Corning Museum of Glass’s pipemaking research guides treat wig-wag as one of the decorative techniques within that family. A wig-wag specifically is the pattern you get when lined glass is pulled with alternating reversals, so the lines read as a tight zig-zag rather than straight stripes.

One honest warning before going further: the terminology is contested. In the community, “wig-wag,” “reversal,” and “switchback” get used inconsistently, sometimes interchangeably and sometimes as distinct patterns. One common distinction you will hear (it circulates mostly through shop and dealer usage, so treat it as informal rather than authoritative) is that a reversal reads as a side-to-side, back-and-forth motion in the finished glass, while a wig-wag reads as a spiral. Different artists draw the line differently. The safest mental model is the museum framing: wig-wag is a sub-category of linework, and the exact name for a given pattern varies by who made it.

Where the pattern comes from: cane, stringer, and the pipemaking tradition

Linework did not appear out of nowhere. Pulling patterned cane (rods of glass with color arranged inside or on the surface) is one of the oldest decorative moves in glass, documented across centuries of caneworking in furnace glass. Boro pipemakers adapted that inheritance to torch work: instead of a furnace gather, the canvas is borosilicate rod and tubing worked in a bench flame.

The American pipemaking lineage itself is usually traced through Bob Snodgrass, who is commonly credited with foundational discoveries in boro pipe aesthetics, including the color-changing effects of silver and gold fuming, and with spreading the craft while traveling in the late 1980s. The details circulate mostly through secondhand retellings, so hold them loosely. The broad picture, a young and largely self-taught movement that built its own decorative vocabulary with linework near the center, is well documented in the Corning Museum of Glass’s pipemaking materials.

At the small end, linework overlaps heavily with stringer skills: pulling thin threads of color and placing them precisely. If you cannot yet lay a straight, even stringer line, that is the prerequisite skill, and the stringer control guide is the place to build it.

Building the cane layup: color choices and encasement

Everything starts with the layup: a base of clear boro (rod or heavy tubing, depending on the project) striped with parallel lines of colored cane. A few practical points, kept deliberately qualitative because the specifics vary by artist and by project:

  • Even spacing matters more than line count. The reversal pattern multiplies any unevenness in the original stripes. Artists take their time getting the lines parallel and evenly spaced before any pulling happens.
  • Color contrast carries the pattern. Wig-wag reads best when adjacent lines contrast strongly. Boro color behavior varies a lot by manufacturer and by individual color, so choose colors you already know how to strike and encase. Our boro color brands explained guide covers how the major makers’ palettes behave.
  • Compatibility is assumed, not optional. Boro colors are made to match the borosilicate expansion family (commonly described as COE 33, though you will also see compatibility stated as a small range around that figure). Stick to colors sold as boro-compatible and defer the fine print to the color brands guide.
  • Encasement is common. Many artists case the lined-up color in clear before pulling, which protects the lines, adds optical depth, and gives the cane a clean working surface.

The switchback pull: turning straight lines into zig-zags

The pull is where wig-wag happens, and it is also where written sources get thin. The step-by-step mechanics live almost entirely in video demonstrations (Colorado Color Company and Glass4Life have widely watched walkthroughs on YouTube), so what follows is the concept, not a recipe, and deliberately avoids specific temperatures, diameters, or line counts.

Conceptually, the artist heats a section of the striped blank until it is soft enough to move, then pulls and reverses direction, folding the lines back on themselves. Heat, pull, reverse. Heat, pull, reverse. Each switchback turns what were straight stripes into a chevron. Do it with a twist and the zig-zag wraps into a spiral. The pattern you end up with depends on how far each pull travels, how sharp each reversal is, and how consistently you repeat the motion down the length of the piece.

Descriptions of wig-wag that come from the furnace-glass world talk about blowpipes and gathers; in the torch-work context the same idea plays out on rod and tubing at the bench, at a much smaller scale, but the logic is identical: a controlled, repeated reversal of softened, lined glass.

Watch the videos linked in the sources before you burn glass on this; thirty seconds of footage communicates more than any paragraph.

Keeping lines crisp: heat control, spin speed, and timing

Sharp linework is mostly a heat-management problem. The common shop wisdom, and it is shop wisdom rather than manufacturer specification, comes down to three variables:

VariableWhat happens when it is wrong
Heat depthOverheating melts the lines into each other; the pattern blurs and colors bleed
Spin and pull speedSpeed affects line thickness; inconsistent speed gives lines that swell and thin
Timing of the reversalReversing too hot smears the fold; too cold and the glass resists or cracks

The recurring theme in every credible demonstration is working narrow zones of heat: soften only the section you are about to move, keep the rest rigid so the already-formed pattern cannot distort, and let each section set up before you move on. Studio-school glossaries also note that how fast you spin or pull affects how thick the resulting lines are; treat that as shop practice, not a published spec.

Boro’s relative stiffness compared to soft glass helps here. It holds detail through reheating better than soda-lime does, which is part of why this style of pattern work grew up in the boro pipemaking world in the first place.

Scaling up: from wig-wag cane to lined tubing

A wig-wag section on a rod is a component. The pipemaking application is getting that pattern onto tubing so it can become hollow work. Broadly, artists either build the linework directly on heavy tubing and then work it hollow, or create patterned cane and sections that get incorporated into a tube build. Either way, all the fundamentals of tube work apply: even wall thickness, uniform heat around the circumference, and constant rotation. That is exactly the skill set covered in working boro tubing basics, and it is why hollow-work fundamentals come before pattern work in most curricula.

One more piece of common shop practice: as lined tube work gets large, many artists move it to a glass lathe, because keeping a big, heavy, patterned tube rotating evenly by hand is its own struggle. See our glass lathes overview if you are curious.

The honest part: why this is an advanced technique

This site is aimed at people choosing torches and building skills, so here is the beginner-honest assessment: wig-wag has a long practice curve. No credible source puts a number of years on it, and we will not invent one, but the structure of the technique tells you why it is slow to learn:

  • Every stage compounds. A sloppy layup guarantees a sloppy pull. A perfect layup can still be ruined by one overheated reversal.
  • The feedback loop is expensive. Colored boro rod costs real money, and a failed wig-wag consumes a lot of it per attempt.
  • The prerequisite stack is tall: rod control, stringer precision, encasement, striking behavior of your chosen colors, and hollow tube work all come first.

Instructors consistently recommend the same path: get formal instruction where you can (classes compress years of trial and error), build hollow-work fundamentals, and practice line placement at stringer scale before attempting reversals. If your first ten wig-wags look like muddy scribbles, you are on schedule. Everyone’s did.

Torch and setup notes for linework

Wig-wag does not require exotic equipment beyond a setup that already handles borosilicate comfortably; if you are shopping, our best torch for borosilicate guide covers what boro work asks of a torch. A few safety notes specific to heavy color work:

  • Eyewear. Didymium or boro-rated filtered eyewear is essential for extended boro sessions; heavy linework means long hours staring into worked boro.
  • Ventilation. Many boro colors get their color from metal colorants, and pattern work means melting a lot of color for a long time. Strong active ventilation is not optional for this kind of session.
  • Fuming. Some wig-wag styles incorporate silver or gold fuming, which vaporizes metal in the flame and demands extra ventilation care. Read the silver and gold fuming guide before combining fuming with linework.

As always, none of this replaces the documentation for your specific equipment: your torch and gas equipment manufacturer’s instructions take precedence over any general guidance here.

Key takeaways

  • A wig-wag is a linework pattern made by pulling striped boro cane with repeated reversals, so straight lines fold into a zig-zag or spiral. Terminology varies; treat wig-wag as one branch of the linework family.
  • The process is layup, then pull: even, parallel colored lines on clear boro (often encased), then a switchback pull that reverses direction on each pass.
  • Crisp lines come from narrow heat zones, consistent spin and pull speed, and well-timed reversals; overheating blurs the pattern.
  • Scaling to tubing layers linework on top of all the usual hollow-work fundamentals, and very large lined tube work commonly moves to a lathe.
  • This is an advanced technique with a long practice curve. Build stringer control and boro tubing skills first, take a class if you can, and budget for failed attempts.
  • Heavy color work and any fuming call for filtered eyewear and strong ventilation, and the manufacturer’s instructions for your equipment always come first.

Sources

Editor’s note: “wig-wag,” “reversal,” and “switchback” are used inconsistently across the boro community, and the step-by-step mechanics live mostly in video demonstrations rather than published written sources. Descriptions here are conceptual; where community accounts differ (terminology, history, exact method), we have flagged the disagreement rather than picking a side.

Related guides

Sources