If you've ever been to an amusement park, you may have noticed ride designers using some non-traditional platforms as projection screens -- the most common example being a steady stream of artificial fog. Projecting onto transparent substances is a different story, however, which made this latest technique a bit baffling to say the least. Colloidal Display, developed by Yoichi Ochiai, Alexis Oyama and Keisuke Toyoshima, uses bubbles as an incredibly thin projection "screen," regulating the substance'
