Another user submitted illusion! Thanks guys! You are what makes this site so wonderfull. Others, be sure to take Lee Wallender, who submitted this illusion, as an example, and start submitting your findings today :) As you see this billboard has different effect when sun is shinning and on a cloudy day. Can you guess how it works? If not, jump inside this article to find out!
What’s interesting about this illusion, is how the billboard enlists sun/earth trigonometry in the selling of suntan lotion. Who would guessed? Imagine what would happen if someone did more of that with architecture! As you might have guessed, the billboard is made of 12,148 aluminium pegs, varying in length from 1mm to 27mm. Each different length peg creates different sized shadow. The different sized shadows create a greyscale image of a woman sunbathing, when the sun comes out!