Tell me again why we buy toys?

Today when Miss Pear woke up from her nap we cleaned our bathroom (Miss Pear's contribution is to flush the toilet once I swish it and wave her cleaning rag around - it is a clean one of course - and generally keep me company and hopefully slowly learn.)

Then she climbed into the shower and closed the door - I thought she was stuck so I quickly opened it for her - she quickly closed it, smiled at me and knocked. We played this game for a while.

Now she is sitting at my desk playing and every time I ask her if she wants to go down stairs she says "no!" Apparently nothing is more fascinating than playing at my desk.