I collected a few items that open and close in unique ways and put them into a box for my daughter (2.5 yrs).
A simple bottle with a screw top.
A pocket watch with a push-top.
She worked on this one with such determination when it was first introduced; and it seemed to be her favorite item in the box. Perhaps because it was such a challenge for her - she needed to figure out how to put her fingers just right on the sides in order to open it.
A locket held together by magnets:
This one is tough for her - it helps to have a finger nail to open this one, so she really needs to use her finger and thumb strength. She's so focused when working on this one, and always so proud when it's open!
A binder clip:
Strengthening those muscles in preparation for writing. She likes to squeeze this one as hard as she can to see how far she can open it - you know the kind of squeeze that makes your whole body shake - that's what she does here!
My son (4 yrs) also enjoys the binder clip in this box so he can show off his strength:
... I like how it's strengthening his pencil grip!
A frame that has a clasp similar to a coin purse closure.
She puts this up to her eyes upon opening and claims it's a pair of glasses.
This locket has a little fold over clasp that hooks onto a little ball ...
She needs to pick the locket with her little finger to pop it open.
A small lock and key:
She likes the challenge of taking the key out and figuring out how to place it back in before opening.
Closing the lock is another challenge as it takes lining the hook up with the small hole, and takes some finger and thumb strength to lock it back into place.
Hope you enjoyed taking a look into my daughter's treasure box!