Quickly create a projector with your phone.
Step 1: What You Need
1. Shoe box
2. Pool noodle ( or any soft foam )
3. Camera lens ( best if 30 to 60 mm)
4. Hot glue
Step 2: Cut Hole in Shoe Box
Cut a hole in the shoe box that your camera lens can fit into.
Step 3: Slice Some Foam
Cut small slices of foam that you use to wedge the phone into place. Allowing you to move the phone forward or backward to focus the image.
Use hot glue or some other adhesive to quickly stick the foam to the sides.
Step 4: Your Ready!
Wedge your phone in and turn off the lights, you'll need to slowly slide your phone forward or backward to get it to focus right, also start off with the box only a few feet from the wall and turn up the brightness setting on your phone all the way.
You can slowly move backwards and refocus to make the image larger. I've gotten it up 60" but the room had to be very dark. Have fun!