The voyeuristic comic potential of x-ray vision has long been recognised.
Older readers may recall ads for novelty glasses, such as the one above, which guaranteed that one would not only be able to see bones through flesh, but, more interestingly, what lies beneath the dress of the girl next door (to your amusement and, presumably, her embarrassment).
Who needs to try and sneak-a-peek upskirt or down blouse, when one can actually see through clothing thanks to a pair of X-Ray Spex ...?
But, alas, such glasses don't really allow one to possess x-ray vision. In reality, they merely create an ingenious (though not very convincing) optical illusion, that is quite literally a trick of the light and its diffraction [1].
And so, unless you happen to be Clark Kent, I regret to say you're probably never going to be able to see through solid objects and normally opaque materials.
Speaking of Superman, it's interesting to note with reference to what we have been discussing, that whilst he mostly uses his power for good, even he can't resist perving on Lois Lane and checking out the colour of her underwear on at least one occasion (although to be fair to the Man of Steel, this was at her invitation) [2].
by asking: What colour underwear am I wearing?
Notes
[1] The principle behind the illusion - as well as its use in a pair of spectacles - was first patented (in the United States) in 1906 by George W. Macdonald. But the man behind x-ray glasses as most people know them, was the American mail-order genius and inventor Harold von Braunhut. He was also the man who sold the world Sea-Monkeys and invisible goldfish.
[2] I'm referring here to a scene in Superman (1978), dir. Richard Donner, and starring Christopher Reeve as Clark Kent / Superman and Margot Kidder as Lois Lane: click here.
For the record, Miss Lane was wearing pink underwear, which, depending on one's sartorial taste, would either compliment or clash with our hero's favoured red pants (famously worn over his bright blue tights).
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