Recently my jeweler daughter, Isabel, made me a great “Swiss Writing Knife” with symbols of seven of the things I’m interested in: A Zhabotinsky scroll (for cellular automata), the Mandelbrot set (for fractals), a robot, A Square (for the fourth dimension), Infinity, a UFO, a Cone Shell (for diving, cellular automata, universal automatism, and SF). It’s gold-colored metal and the little “blades” swing in and out, with the icons in silver-colored metal riveted on.
I tend to adjust the knife according to what kind of story or novel I'm working on, and I keep it by my keyboard as a good luck amulet, or an embodied muse.
Isabel's business, Isabel Jewelry is in Pinedale, Wyoming, and she makes most of her sales over the web. One of her customers was in fact Boing's own Cory Doctorow, who had her custom-make a pair of crypto-device wedding rings.
As a sometime zinester, Isabel has a cool drawings site as well—check out her "Get Back" story about thongs. Isabel's graphic novel, "Unfurling: The World's Longest Comic Strip," will be on display this November at the SOMArts Gallery in San Francisco, all four hundred or so feet of it!