Pepper's ghost: 360° illusion pyramid

While waiting for the holographic projection screen film to arrive, I run a test based on Pepper's Ghost technique. Out of a few options that I found, I chose the pyramid method to test 360° hologram (faux)  illusion: 

On the bottom of the pyramid, made out of a sheet of OHP transparent film, a 6×6 (cm) white cardboard is placed, and after removing the top parts of the pyramid ( about 9mm each)  a 1×1 (cm) cardboard is placed on the top as dimmer. 

A 2D image, which is consist of 4 exact same skulls, is uploaded in the ipod.  

The pyramid top would be placed in the middle of the 4 images to create 3D holographic-like illusion. 

Yuri Endo 2012

Reference:  3D holographic fireplace, Structuring by multi-beam interference using symmetric pyramids, 3D Holographic Display Research blog by Ujjval Panchal, 3D Holographic Projection Bx Research blog by 72by3 studio, d'strict Louis Quatorze interactive installation, 360 hologram illusion pyramid how to, Pepper pyramid