When role playing games appeared (ca. 1974), they came with an intriguing array of dice to add randomness to the statistics they used. In addition to common (6-sided) dice, they used regular polyhedrons with four sides, eight sides, ten sides, and twenty sides. The four-sided dice, for example, were tetrahedrons.

Ancient Egypt had board games that used a simpler method for creating four-sided dice. The Egyptian method works for three-sided or five-sided dice, as well. Can you suggest a way to make an object you can roll that will randomize four different choices (or five, or three) with equal probability?