Build a real working camera obscura from a shoebox
A pinhole, a dark box, a white wall. They see the world upside-down in the dark.
How to do it
Take a shoebox. Cut a 4x4 inch window in one short end, tape a piece of wax paper or thin white paper across it — this is the 'screen.' On the opposite end, poke a single tiny pinhole right in the center with a needle. Wrap the long sides of the box in black tape so no light leaks in. Bring it into a dim hallway. Point the pinhole at a bright window or a lamp across the room. Look at the wax paper end (cup your hands around it to block stray light). You see a tiny, upside-down image of the window — projected by physics, no lens, no electronics. Show them: this is how their eye works, how every camera ever made works. The world is upside-down on their retina too — their brain flips it.
What you'll need
An empty shoebox
FreeWax paper or thin white paper
FreeBlack electrical tape
AmazonA sewing needle
Free
Opens Amazon with everything pre-loaded in your cart.