My three year old daughter absolutely loves this activity! It was so easy to put together and occupies her for a while (aren't those the best type of busy ideas??) I had a bunch of leftover buttons from my hairbow making days and the tray is from her Melissa and Doug bead set. She can sort the buttons by color, size and shape. The tray is really fun to use since it has a lot of sections that are different sizes and keeps the buttons (mostly) contained.