This lock and key activity is self explanatory. Four locks, four keys.
Caspar is now at that age/stage/sensitive period where he doesn't sit still for long. Unless he is of course highly engaged. He has over the last few months enjoyed using our locks at home so I thought this would hold his attention. And it did. There is something about the mechanics of the lock that appeal to him.
This is an activity that would appeal to many ages and most likely to children much younger than Caspar. It does require a little patience to work out which key goes in which lock and the fine motor skills to actually insert the key and open the lock.
It's also a super easy activity to put together if you already have a few locks at home.