What Does Your Child Do At Playcentre...???
Mine does fun things like line up animals / dinosaurs / insects in a row for hours and hours... pick them up, put them in the 'row' (albeit a rather crooked row), take them all down and start again with the next innocent bunch of 'things'!
It can keep her occupied for up to 30 minutes, and this proud Mum had to take a photo of the dinosaur line-up... I think it's cute, even if I don't understand the obsession!