Ern plays this..

twice a day with Kong Kong. She will sit on the floor at the balcony and next thing you see, she will take out all the clips and put them back into the basket again. She repeats the 'take out and put back' until we carry her away. Normally it will follow by a short whine before we divert her attention to something else. She has been playing this for months and yet,she is not bored with it. What is so fascinating?