Repeat four times. Tape the four shapes together, with the longest sides facing the top of the structure. Select the holograph-specific video you'd like to project - this is a good example. Place the shape over a video playing on your smartphone to create a mirrored, 3D hologram.Stick the open edges of the sheet together using clear cellotape. If you have used the trapezoid template: Join the four edges to form a pyramid shape. Stick them together. Either way, in the end you will have a pyramid like the one show below.
