Steve Erenberg, aka Radio Guy, has what could only be described as a one-of-a-kind collection.

The collection includes anatomical models, armor, scientific instruments, and objects that are nearly indescribable. But many of the items share a common theme: they are strange objects worn on, or illustrating, the head.

Among the amazing head contraptions in the collection are shock therapy masks, an optmophontome, a radio wave helmet, a bizarre light therapy mask, and a terrifying dental mannequin.