The only thing I can remember is the cover of one his programs. It had an image of him and also of the rope trick, besides other things. I forget what's inside the program now, but the program turns every so often.
There was guy, I think he has passed away recently, that collected only the rope trick and anything related to it. Right now I can't think of his name.
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I buy,sell + trade Houdini, Hardeen items.