Imagine how you might pass a straight metal rod through a curved hole. How does that work if neither bends? Is it impossible? This demonstration at the Science Museum in Valencia, Spain shows that it’s absolutely possible with some creative thinking: Motion changing where objects intersect over time. Gif via Reddit:
Update: We want to build our own! Here’s a great example of how some paper, a toothpick, some tape, and a straw can recreate this excellent science project. There are also instructions for a stronger wood version at Exploratorium.edu.
— ChuckStoffle (@ChuckStoffle) March 19, 2020
In the archives: more spinning and more geometry, including a few Eames films from Mathematica: A World of Numbers… and Beyond.