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The darker the room, the more realistic the illusion.
Search YouTube for "3D hologram video" on your phone. These videos usually feature four identical images on a black background.
Set your phone screen brightness to 100%.
This project uses a transparent plastic pyramid to reflect images from a smartphone, creating the illusion of a 3D image floating in the air.
Join the four pieces together using tape or glue at the edges to form a pyramid shape.