X-rays

From Oneiropedia

X-rays are magic beams that can see through solid materials such as clothing, human skin, buildings, and walls; however, they cannot see through lead.

[edit] Common Uses of X-rays

X-rays are used by doctors and dentists to get detailed views of human bodies, especially the bones and teeth. However, the patient often must wear a lead apron in order to not get cancer. Also, x-ray vision was used by Ray Milland in the film X: The Man with the X-ray Eyes. As that film taught us, "If thine eyes betray you, pluck them out."