My new toy

What do the following items have in common - 6 short straws, 6 frozen juice lids, and an empty parmesan cheese container?

My friend KD inspired me to make this toy... shape-sorter redefined! As you can see, it was a big hit!
The lids fit through the bigger opening, and the straws fit through the small holes. When all the items are put inside, it makes a great shaker toy! :)