Die-hard Photoshop users will get a kick out of this. David at IronicSans.com wanted to make an image that looked the same in the histogram view. For the laymen in the crowd, a histogram is a bar graph representing all of the tones in an image. Most pro-sumer digital SLR’s come with a histogram view so photographers can check for clipping of colors. In Photoshop you can see the histogram of your image by going to Image -> Adjustments -> Levels. He didn’t get a very interesting image from that as you might imagine.
Then he got the idea to try and create an image in the histogram view. After some tedious tweaking by hand he came up with this rather dull image.
But if you look at the histogram then you will see this.
The explanation of how it was done boggles my mind, although at the heart of it, it is just math. This reminds me of the Aphex Twin song that when viewed on a spectrograph (a way of visualizing sound) you saw a creepy face.