My youngest grandchild is getting into playing peek-a-boo. She finds it great fun when I hide my face behind my hands and then pop them open and say “boo”. We have many delightful moments together as we find variations in hide and seek type games. I remember playing similar things with my own children as young ones. Gradually they learned to cover their own faces to play the game themselves. The interesting thing with my wee ones was that, when their faces were covered by their hands, they believed that I couldn’t see them at all. As long as they couldn’t see me, surely, I couldn’t see them. It was…