My mom found this ice cube tray for water bottles in her cabinet and told me to think of an activity to go with it for O. I immediately thought of clothes pins... they'd fit perfectly. And they did! O had a great time putting the clothes pins in the tray. I only gave her enough for the 1st row to start off with because I thought it would be too overwhelming to have much more than that. I was wrong. She kept asking for more until the entire tray was filled. This is definitely a work that we will do again soon.