It's not as hard to make an invisibility cloak as you might think, but making one that's truly sophisticated is another matter; metamaterials (substances that change the behavior of light) are hard to build. Rice University appears to have solved part of the problem, however. It just developed a squid-like color display (shown below) that should eventually lead to smart camouflage. The new technology uses grids of nanoscopic aluminum rods to both create vivid, finely-tuned colors as well as polarize light. By its lonesome, the invention could lead to very sharp, long-lasting screens. The pixels are about 40 times smaller than those in LCDs, and they won't fade after sustained light exposure.