Hologram -

Search YouTube for "3D hologram video" on your phone. These videos usually feature four identical images on a black background.

I can give you more specific instructions or suggest the best YouTube videos to use! Hologram Kits - LitiHolo Hologram

Place the plastic pyramid upside down (small side down) in the center of the video playing on your smartphone. Search YouTube for "3D hologram video" on your phone

Trace the trapezoid stencil onto the transparent plastic four times. Cut out all four pieces. Hologram

Join the four pieces together using tape or glue at the edges to form a pyramid shape.