The latest invisible tech, called Quantum Stealth, has been developed by Hyperstealth, a Canadian camouflage design company. The material is as thin as paper, inexpensive, and requires no power source. While it doesn’t work quite as well as a magical cloak, it does a pretty good job of concealing and is certainly confusing to look at.
The material uses an approach that you might already be familiar with: lenticular lenses. If you have seen one of those pictures that appears 3D depending on how you look at it, you have seen this tech.