Check this out: https://youtu.be/X9_6EbucCPQ

Cover your windows with opaque garbage bags, cut a small hole into one (<1in), and voila! Camera obscura!

Weird, but wonderful. I laid down a large (butcher paper) white sheet under a tree and took a picture. Much later on, I took that same picture and a pencil I had at the time, and projected the picture back onto the butcher paper and traced the picture back onto it. Pretty cool art!