Bits & Pieces similar to Lego? (Museum of Nature)

These are hanging on a post in front of 37 Argyle just down from Elgin .. they appear to be something that a child would play with sort of like lego, etc.?
Earlier last week there were also some paintings with them but they've been picked up and gone to new homes, etc.
When I notice that they're gone I'll edit this post.

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