WE MADE THIS.
You will note, please, that I said "we" and not "I." That is because I had literally nothing to do with like 99% of this project, because I am not talented like that. I do, however, have a friend, Erin, who is, and who responded to our son's love of cave/fort things with "Well, let's make him one!"
And so we (and again, by "we" I mean "Erin and her husband, who just happens to be a master woodworker") did. And then we covered it with polka-dot flannel and added rainbow tassels, and the whole thing is just flat-out RIDICULOUSLY COOL.