Baile Zhang, an assistant professor of physics at Nanyang Technological University in Singapore, unveiled his "macroscopic invisibility cloak" on Monday at the TED 2013 conference in Long Beach, California. According to Zhang, the "cloak is made out of two pieces of natural calcite (optical crystals) that are joined together. The calcite bends light and suppresses shadows, tricking the eye into seeing nothing." Continue reading for two videos and more information.
Carla Sinclair of BoingBoing says: "The cloak's ability to conceal an object so that both the cloak and the object become invisible was astonishing. Zhang placed the cloak over a bright pink Post-it note and voila! Nothing! The pink paper disappeared. And the cloak itself wasn't really visible in the first place."