A shape that looks like a blue disk with a black circumference when seen from below, and like a yellow triangle or a red square with a black rim when seen from other sides. Mathematically, the open question is whether a 3D shape exists where the three views don't have a black rim (so just a yellow triangle, etc.). The shape must have "thickness" everywhere.
A traffic sign to warn for bird lovers (present to my brother, an ornithologist).
Kissing snakes: two-piece figure consisting of an abstracted blue snake built from round tubes that are connected using right angles, and an abstracted red-brownish snake built from square blocks that are connected using right angles and 135 degree angles.
A Christmas and New Year card (for 2002) that can be constructed and changed like composable art, and consisting of a red square, a blue disk, and a yellow triangle like Kandinski's Color Shapes.
Last modified: Marc van Kreveld, November 21, 2002
