Optical Illusion: 'Four Perfectly Round Circles'
Counting down to quittin' time on a Friday can grow mind-numbing when you have only the whole of human knowledge at your fingertips. To help inject a little frivolity -- and break up those end-of-the-week doldrums -- we bring you a favorite Switched pastime: getting those synapses and neural circuits firing with an awesome optical illusion. Although this latest offering may not be quite as ...









