Invisibility Shield

A lenticular lens is an array of lenses, designed so that when viewed from slightly different angles, different parts of the image underneath are shown. But also, the way a lenticular lens Refracts light means that a small area behind the lens will be hidden from an observer looking trough the lens. Recently, HyperStealth Biotechnology Corp designed a shield/wall that takes advantage of this effect in order to hide things as military equipment or personel.

Layer lines on a 3d printed surface can also act as a lenticular lens. Theese simple shapes can act as an invisibility shield as long as they are printed upright using a transparent material. you can place an object a few inches behind one of theese and it will not be visible trough the shield at certain angles.