Ribbon Thru Glass Matrix David DeVal's lock was made

David DeVal's lock was made entirely of brass

and can be shown EMPTY in between

Now Cut That Out (by David Williamson)

Object to impossible location is one of the most classic

Ribbon Thru Glass Matrix David DeVal's lock was madeShow a wooden frame and a transparent plastic sheet both having series of similar holes in them. The plastic sheet is then placed inside the frame, holes of both the frame and sheet coincides. A ribbon is threaded through all the holes one by one in the frame and the plastic sheet locking them together, thus making it impossible for the sheet to escape from the frame. Yet in the count of three you magically emove the transparent sheet off the ribbon