When you see David Blaine stick an ice pick through his own hand without leaving a mark, the sight can unlock a door in your brain: Is this real? It los real. If this is real, what is reality? It’s a freeing feeling, as if the world has been made anew right in front of your eyes; by witnessing something senseless, other things begin to make sense. Admittedly, talking about this newfound awareness can make you sound like a rube or an acid casualty, but its power should not be totally denied. Frankie Cosmos’ Greta K knows what it’s like to have your mind rearranged by a magic trick. She wrote a song about it.