Mystery Blox Steven Macrow & Nicholas Dakin

Mystery Blox is a great idea by Steven Macrow and Nicholas Dakin and brought to life and produced by PropDog.  Based on the Kennedy Box principle, the spectator picks and signs a playing card (not forced) the magician then assembles the four walls of a lego box in front of the spectator, places a lid on the box very cleanly right in front of the spectator's eyes.