Swezey, Kenneth: Popular Science, pp. 167-170, septembre 1952
Can you guess which of these kitchen saucers was farthest from Ken Swezey's camera and which nearest when he made
this trick picture? Here's a tip: the photo was shot to demonstrate that unless you know the size of an unfamiliar
object outlined against the sky, you can't judge its distance, and until you know its distance you can't possibly
judge its speed. After making your guess, turn to the end of the story to see the answer.
Kitchen-table tricks suggest that those strange sights in the sky may be just optical illusions—and
nothing more.
You don't have to stay up all night sky-gazing to catch a glimpse of some flying saucers. You can see them right in
your own home, using just a milk bottle filled with water, a flashlight and a few other common gadgets.