What do I do with the projector?

Hint 1 of 5:

Have you played with it?

Hint 2 of 5:

There is a slot to put things in, a switch to turn on, and a dial
that you can turn.

Hint 3 of 5:

Experiment with anything, and everything you can put in the projector.

Hint 4 of 5:

You must turn the dial to bring the projector in focus.