How to Read Wood Grain and Figure: Curl, Quilt, Burl, and More
Quick answer
Grain describes fiber direction and cut (plainsawn cathedrals, quartersawn stripes); figure describes light-play patterns from growth quirks: curly (rippled fibers), quilted (billowing), bird's-eye (tiny swirls), burl (chaotic growths), spalting (fungal ink lines). Figure multiplies value — instrument-grade curly maple prices far above plain — and each pattern has workability consequences.
Two boards of the same species can differ tenfold in price, and the difference has a vocabulary: grain and figure. Grain is the tree's architecture — fiber direction, ring placement, how the sawyer cut it. Figure is the optical event — patterns that shimmer and shift under light, caused by growth quirks that make fibers catch light unevenly.
This guide teaches the vocabulary: the three cuts and their looks, the figure types and their causes, spalting's controlled decay, and the practical notes — because figure that delights the eye also complicates the plane.
How does the cut create the grain pattern?
The same log yields three looks. Plainsawn (flatsawn) — the common cut — slices tangent to the rings, producing the arched 'cathedral' patterns on every ordinary board. Quartersawn cuts radially, yielding straight, tight stripes — and in oak, the dramatic ray-fleck shimmer that defines Arts & Crafts furniture. Riftsawn angles between, giving the straightest, quietest grain, prized for clean modern lines.
Cut affects behavior as much as looks: quartersawn boards move less with humidity (why they floor gymnasiums and build fine drawers) and cost more (the cut wastes wood). Recognizing cut is part of reading any board — cathedral arches versus stripes is the first thing a face shows you.
What causes curl, quilt, and bird's-eye?
| Figure | The look | The cause |
|---|---|---|
| Curly / tiger / fiddleback | Rippled cross-stripes that shimmer | Wavy fiber growth — light catches alternating angles |
| Quilted | Billowing pillow shapes | Undulating interlocked growth (maple's specialty) |
| Bird's-eye | Scattered tiny swirls | Dormant bud traces (sugar maple, cause debated) |
| Ribbon / interlocked | Alternating stripe bands | Spiral growth reversing (mahogany's signature) |
| Crotch / flame | Feathered plumes | Where trunk forks — compressed, contorted grain |
| Burl | Chaotic swirls and eyes | Tumor-like growths of dormant buds |
The shared mechanism: figure is *chatoyance* — fibers deviating from straight, so polished surfaces reflect light at shifting angles, making patterns that move as you move. That's why figure photographs shy and stuns in person, and why finishing (which deepens the light-play) transforms figured wood.
What is spalting — decay as decoration?
Spalting is fungal artistry: fungi colonizing dead wood draw zone lines — thin black ink-like boundaries where competing colonies meet — plus bleaching and color streaks. Caught early (before rot softens the wood), spalted maple, beech, and birch are prized turning and craft stock; caught late, it's just punk wood.
The soundness test: press a fingernail — solid spalted wood resists like normal stock; spongy means the fungi kept eating. Spalted stock turns up in firewood piles and tree removals constantly, one more case of value hiding where identification stopped. (Woodworkers: wear dust protection with spalted stock — fungal dust is a real respiratory irritant.)
What does figure cost in workability?
The light-play mechanism — fibers changing direction — is exactly what makes figured wood tear out under plane and jointer: the blade meets grain rising and falling in waves, and lifts chunks where it should shear. The workarounds are craft knowledge: high cutting angles, freshly sharpened blades, shallow cuts, scrapers and sanding over planing, and respect.
This is also why figure concentrates in certain uses: instrument tops and backs (thin, sanded, finished to maximum chatoyance), veneers (slicing sidesteps the planing problem and stretches rare figure across more surface — the logic of fine veneered furniture), turnings, and small showpieces rather than structural lumber.
How does figure change value — and how do you spot it cheap?
Figure multiplies within species: plain maple is workaday; heavy curl or quilt prices toward walnut territory; instrument-grade figured billets price per piece, not per board foot. Burls sell by the pound for turning. The grading is subjective and visual — depth, coverage, and consistency of figure — which is exactly why recognition pays.
The cheap-figure hunting grounds: plain-priced lumber stacks (the wet-thumb preview), tree services and firewood piles (crotch and burl sections), painted furniture (figured maple hid under milk paint for centuries), and estate workshops. A scan of any interesting surface reads both species and figure — the combination is the price.
Key takeaways
- Grain = architecture and cut (cathedral plainsawn, striped quartersawn); figure = light-play from growth quirks.
- Curl, quilt, and bird's-eye are chatoyance — moving patterns from wavy fibers catching light.
- Spalting is early-stage fungal decoration; the fingernail test separates art from rot.
- Figure fights the plane — tear-out is the tax; scrapers, sanding, and veneer are the workarounds.
- Figure multiplies price within species; instrument-grade billets price per piece.
- The wet-thumb preview reveals figure on rough boards — how sleepers get found in plain stacks.
Skip the guesswork — scan it
Wood Identifier App - Wood ID: identify wood species from grain, color, and texture.
Frequently asked questions
What's the difference between grain and figure?
Grain is fiber direction and ring pattern — largely determined by species and how the log was cut. Figure is the decorative light-play (curl, quilt, bird's-eye) caused by fibers growing in waves. A board has grain always, figure occasionally — and figure is where premiums live.
Why is quartersawn oak special?
The radial cut exposes oak's huge rays as shimmering flecks — the Arts & Crafts signature look — and quartersawn boards are more dimensionally stable. The cut yields less per log, hence the premium.
What causes curly maple?
Fibers growing in waves rather than straight — the polished surface then reflects light at alternating angles, creating ripples that shift as you move. The cause is growth quirk, not species: curl appears unpredictably, which is why figured trees are prized finds.
Is spalted wood rotten?
It's early-stage decay caught at the decorative moment — fungal zone lines without structural loss. The fingernail test decides: firm spalted wood is craft stock; spongy means the rot won. Work it with dust protection.
How do I check rough lumber for figure?
Wet a patch and tilt it to the light — chatoyance invisible on dry rough surfaces shimmers into view. That preview finds curly boards in plain-priced stacks, the lumberyard's classic sleeper hunt.
Written by the Toscan Apps Team
We build AI identifier apps and test them against the real world daily — estate-sale furniture, garden soil, drawer-found seeds, lumber-yard offcuts, and houseplants included. Guides are checked against field references and refreshed as our models improve.
