Girl gone wild

Not so much for the gratuitous bath-time pictures, but for the really amazing display of obsessive behavior; Dear Alex's wild display of arranging and re-arranging an assortment of bath toys - don't look at Dear Alex in the sequence of pictures, look at the row of cups and ducks. There are a lot of in-between shots missing, and daddy didn't touch - or hand Alex anything.
It went sort of like this: All of the cups and ducks start in the tub, then are lined up - first cups, then ducks, and then she starts moving them around like some kind of shell game. At some point, some part of the arrangement displeases her, and everything goes back in the tub, and the arranging starts over again. This went on for about half an hour - It made for a long bath, but I couldn't stop watching.
I was fascinated by how important this seemed to her, and can only wonder what goes on in her head - is it pure tactile delight, an attempt to communicate, an exploration of aesthetics, or performance art?