Philadelphia Phillies Ben Francisco reacts after being hit in the head with a pitch by Cincinnati Reds Logan Ondrusek during the MLB National League Division Series baseball playoffs in Philadelphia, Pennsylvania, United States in this October 8, 2010 file photo. (Photo by Tim Shaffer/Reuters)

Lenticular cloud and zebra. (Photo by National Geographic)

Ukrainian artist Oleg Shuplyak masters the optical illusion in his incredible scenic oil paintings.