Ghost in the box!
How to use?
Watch how the ghosting dances in the middle of the acrylic pyramid.
Almost every glass reflects some part of light.
If you place a well-lit, glossy object in front of the glass in an angle of 45 degrees, the light received by our eyes in 90 degrees gives our brain to believe that the object is behind the glass.
In this case a 3D video projection is reflected by four acrylic sheets, that’s why we can see a 3D image in the middle of the pyramid when watching it from a certain angle. This technique is also applied in theatres, ghost trains of amusement parks, and “holographic” concerts. The name of this illusion comes from one of the inventors, John Pepper.