DONG host Michael recently visited Sydney, Australia and noticed a strange optical illusion – the famed Sydney Opera House looks like it gets larger the further back you stand from a window looking out at it. Apparently, it’s related to the size and position of an object’s frame.
Take a look at the video, and you’ll swear that these balls are spinning in a circular orbit. But look more closely, and you’ll see that each ball is moving along a perfectly straight path. The mechanical model is based on a design by 16th century Italian poymath Girolamo Cardano.