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just 28
I've just found that I keep coming across the number $28$.
Next Year's calendar for February:
Screen 09/12

then there's my set of $28$ dominoes:
S Dominoes

So, why don't you explore this number? Find $28$ flat shapes the same and put them together in some way.

Here are some I found using circular discs, octagons, hexagons, triangles and pentagons.
discsnew octhex

tripent
You may like to try $28$ cubes and get something like this:
28 new
or put together to make a caterpillar with changes at the ends.
cateerpillar
Let us know what you come up with and what you notice.