Inkle Loom


Weaving is one of my favorite crafts because it’s meditative and challenging, practical and artistic. It combines plain-woven cloth’s simple elegance with the astounding complexity of a kilim split-stitch tapestry. I love the way woven straps look, but the idea of warping my floor loom just to make something as... Read more »

Egg Heads Puzzle


As a retirement present for Joe Malkevitch, a geometer friend who likes puzzles, I designed and built this 1′-diameter Egg Heads puzzle from ¼” walnut. Many of my sculpture and puzzle designs require laser-cutting or other computer-guided fabrication technology to accurately produce intricate parts. But this design is simple enough... Read more »

Marble Adding Machine


Computers add binary numbers constantly, but we never see how. This elegant machine does the math using glass marbles. I started building marble track machines years ago using Lego. I experimented with all sorts of crazy ways for the marbles to descend. One was a rocker that shunted a stream... Read more »