All of these have been suggested before, except for the sponge tower, but your name and especially your avatar make me assume you are trolling.
If you are serious, it would seem the sponge tower would stick out like a thumb with the barren skin cancer known as our ocean. It would fit better if sponge spawned naturally.
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Before you judge a man,walk a mile in his shoes; after that who cares? He's a mile away and you've got his shoes!