If you jump into bitforms Gallery right now, you might see my wallet... and keys... and iPhone. But you have to give it something from your pocket first.
Don't worry - the machine will return your stuff, but it will keep an image of it forever to share with other visitors. Simply place any object on the TSA-style conveyor belt and watch it travel under a scanning box. The other side returns your object, but it leaves a projected ghost image of it traveling along the belt in its place. Every time it does this, it adds several other "ghost objects" that other people have left before you.
p.s. There's also a reverse disco ball that can only be viewed from the INSIDE of the ball (!!!) Please ask the gallery staff for help (they're super cool about it).