Her ears redden briefly again. "It is a tradition, and the Ninth is nothing without its traditions," she says awkwardly.

She clears her throat and studies the diagram. "So--the weaves of Air overlap in a lattice at right angles, over then under, and expanding indefinitely."

"If we draw in the inner turns of the spiral and draw the spoke for Air--" She does so-- "Then at each intersection we should indicate the weaving." She marks these intersections with a quick line. "But that is only one row. I am not sure how to indicate the expansion in the second dimension. What do you think?"