RE: #12 What is it? First to guess right wins!

[apanamamama]

I'm going with the underside of a mushroom
or a shell
or a sand dollar on the inside. But I think all of those might possibly be wrong. :)

Comments

[insideoutlet]

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@apanamamama I can see that except if you look closer there is some bit that make it not a mushroom or anything similar to it. Thanks for playing :)