Kaleidoscopes have got to be the coolest toy ever. Maybe I’m showing my age, but long before the Internet and Wii, I could while away an afternoon looking at all of the pretty patterns I could create with just a turn of my hand. But now, courtesy of the Internet, we have this. Where I made this:

Take a closer look; that’s the photo of me zip lining! Can you believe how beautiful that is?

Edited to add: How to make a hand-held kaleidoscope.