We got the girls an inside ball pit for Christmas. They played in it all of the time until recently. To make room for different toys I had planned on putting the ball pit away. Then, all of a sudden, they were interested in the ball pit again, of course. I kept it up primiarily because they were playing in it together now and it was so cute. I would just hear them giggling in there, like in the video I posted last week.
If you watch the video again, you will see that Maddie has figured out that the ball pit is flexible. That is how she was doing peek-a-boo with Ruthie. Well, that was apparently the beginning of the end for the ball pit. The other day I walked into see this progression of events.