Serious play

Willa has started to figure out the world via her set of nesting cups - 10 plastic buckets that fit in each other. She loves to put the small ones in the bigger ones and stacking the bigger ones on top of smaller ones and tossing what she's not interested in over her shoulder. Last night I was amazed to watch her put 8 of them together in order on her own. Before she smiles - ever - she needs to have it figured out. It could be a person, a room, a toy... I'm sure she enjoyed the cups, but the entire 15 minutes that she played with them, she never cracked a smile. Very serious concentration. "No problem mom, can I take a bath now?"