Can a game of Peek-a-boo change the world?

Peek -A -Boo .. Such a simple game but has alot of benefits… When to start playing peek a boo ..?? After 4-5 months of age.. Till what age you can play peek a boo ?? Till your baby enjoys playing it.. What are the benefits ?? 1) your child will understand object permanance .. As a newborn babies think that the things which they are not seeing ,they do not exist .. But as we play peek a boo repeatedly and appear and disappear ,they come to understand that the things which they are not able to see