See that teensy Tinkerbell-shaped light above? That's not CGI -- that's a real floating display, and it's completely touchable too. Mid-air plasma displays aren't that prolific yet, but they're not exactly new either. However, floating lights created using existing techniques can usually burn skin, since every "voxel" (a pixel in 3D space) is made by heating molecules with nanosecond lasers. In order to make them safe to touch, a team of researchers from the University of Tsukuba, Utsunomiya University, Nagoya Institute of Technology and the University of Tokyo, used lasers that fire bursts of plasma every few femtoseconds instead.