I worked maintenance and night security at a big art festival recently for several months. After seeing every single piece of art for the 40th time (that night), it gets BORING beyond your wildest boredom and you get pretty giddy around 2am due to the idiotic irregular hours and lack of sleep.
You have to keep your numbed out mind busy or you'll fall asleep...and there was this one booth with a bunch of really nice kaleidoscopes.
Extreme exhaustion, boredom, mind drain, bits and pieces of your mind passing out, an overactive imagination, borderline hallucinations due to lack of sleep for weeks, knowing you have to stay awake for another 4-5 hours, a flashlight, and one kaleidoscope for each eye is NOT a good combination at 3am.