Have a look, see if you can guess what it does:
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I correctly guessed it was used to clean something, but incorrectly guessed the thing-to-be-cleaned had two halves, to be kept divided by the center diamond. And I had no notion what the thing-to-be-cleaned was.
The object is actually for cleaning suede shoes. Apparently the rubber is soft and tacky, and picks up dirt while raising the nap. The center diamond in the one above is not a consistent feature, as evinced by this variant:
I’ve no idea how you’re meant to clean the dirt out of the brush afterwards; perhaps it rinses out?
Source: core77