Over at The Guardian, mathematician Alex Bellos has an article series in which he asks readers to send their solutions to a weekly puzzle. That sounds innocent enough, but this week's installment might have caused architects to double-take: inspired by a reader who remembers it from his days as an architecture student, solving Monday's puzzle suggests that a reader is "smarter than an architect."
The puzzle itself looks somewhat like a child's block puzzle. Three holes—a square, circle, and triangle—are presented. But unlike a child's puzzle, in which you'd normally have square, circular and triangular blocks that fit the holes, the challenge here is to visualize a single block which would fit perfectly through all three holes.