Critical moose
Eye of Cthulhu
That doesn't make sense. Back wall to hold up the sand? There is still nothing under it. It's illogical.I conclude that it is sand, but that the sand backwall keeps sand up, so that the underground desert is possible.
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There isn't any of that stone under it. It is just the sandPedguin speculated that it might be a kind of 'Sand stone' to make underground deserts possible.
Edit: yay! Page 85