First shape found that can't pass through itself

A mathematician in the late 1600s won a bet by proving that a tunnel drilled through a cube along one of its inner diagonals could allow another cube of the same size to pass through. This discovery has sparked interest in identifying other shapes with similar properties. Tom Murphy, a Google software engineer, has been exploring this problem in his free time, considering it a fundamental and intriguing mathematical challenge. The article discusses the historical context of this problem and the ongoing curiosity surrounding shapes that cannot pass through themselves.