Grain in Briar

Grain (English grain) is the collective name for the lines, rings, and speckled patterns on the surface of a briar pipe. It's not decoration; it's the tree's anatomy: the capillary channels that carry water inside the underground burl of the tree heath reflect on the surface in different forms depending on the angle at which they're cut. Grain in a pipe therefore reveals both where in the burl the wood came from and how the maker oriented the block.

From Capillary Channel to Pattern

Tree heath (Erica arborea) develops a woody burl called a lignotuber between its trunk and roots. This is the water and nutrient reservoir that lets it resprout after fire or drought has taken the upper part of the plant; field studies indicate that replenishing the reservoir once spent takes years. As the burl grows slowly, thin channels form to carry water upward, fanning outward from the center. What a block promises can only be seen once the burl is split; this uncertainty is one of the most nerve-wracking stages of pipe making.