We love using light projectors to entertain our children. The children find it so fascinating and it helps with their visual tracking skills. If you don't have a light projector, bubbles are another great way to practice visual tracking.
The wooden mobile you can see in the back is a tool we use to entertain the infants. The teachers are constantly changing the items hanging from the mobile to keep the children from getting bored of one item. We also utilize toys like balls and bead necklaces (requires supervision) to encourage tummy time.