Babies, man. They don't understand anything.
For this particular baby, the shadows created by its parents' hands are a conundrum requiring hours of study.
Eyes wide with surprise, this baby has the poise of a Zen guru wondering at the marvels of the universe.
But, once the baby realizes the dark shapes belong to mom and dad, it clearly decides shadows are a positive thing and cracks a grin.
One mystery down, a lifetime's worth to go.