It’s what cushions were made for!
When your baby is looking at you, you can hide behind a cushion. Then pop up with a "peek-a-boo!" Then, do it again, by hiding and then popping up on the other side.
Very young babies think you’ve vanished completely when you hide, but eventually they learn you’re still there! Wow! Things still exist even when you can’t see them?
It’s amazing what babies can find out just by playing.