There's no Photoshop magic happening here, but a dad's puzzling video of wooden train tracks is guaranteed to trick your eyes. Marc Blank-Settle posted his mind-bending discovery when he was cleaning up his son's toys last week:
Watch it a couple times if you have to, but it's pretty clear that the pieces are the same even though they look different when placed side-by-side. And while it may appear to be witchcraft, this optical illusion is actually a scientific phenomenon over a century old.
Psychologist Dr. Joseph Jastrow discovered the visual trick all the way back in 1892, but his work has been resurfacing a lot recently. (He's also the mind behind the popular duck- rabbit figure.) The Jastrow Illusion, as it's known, all depends on how the identical shapes are positioned.
When aligned to one side, your brain is tricked into comparing the shorter arc to the longer arc, leading to the conclusion they're different sizes. But if the shapes are centered, they look the same again. Just check out this example for the visual proof: