" She took out a charcoal stick and began to sketch-- on the workbench itself. Of course the moon wouldn't come to her in songs or poems or crystals or whatever... she felt the most centered, the most tranquil, when she was painting or drawing. Lost in her own world or in new ones she imagined. She shouldn't have made a chart; she should have drawn a circle, with the moons going from waxing to waning all the way around...
She hummed to herself a little, the way she always did when she painted.
Her hair began to glow.
A little shading here, a few light strokes in the middle of the full moon for the face that Rapunzel saw there... Circles and shadows and crosshatching... She worked extra hard on the profile of the fatter waxing crescent, where the moon would be now. She knew what it looked like as she felt her hand shape it.
Her power surged; her hair began to sparkle.
She looked around frantically for something to release her magic on. The first thing she saw was her tea, so she grabbed the red clay cup and wrapped the end of a braid around it.
Just like with Pascal, sparks sprayed off her hair and over the object.
When they faded they revealed...
... a heavy, crude clay cup.
Rapunzel started to slump in disappointment-- and then noticed something. Where the hair had touched the sides, the cup was now shiny black, like onyx or obsidian. "

― Liz Braswell , What Once Was Mine