In a previous discussion it was determined that most
magic tricks aren't
patented (for fear of revealing the method) or copyrighted (only the way
it's written down in a book or recorded on a DVD or video is copyrighted).
However, isn't exposure of commercially available effects considered
[[piracy]] then?
I don't see how. It's possible that stealing someone else's trick for
your magic show might be piracy, but describing a trick in an
encyclopedia article shouldn't be. We're not reproducing the trick,
just describing it.