Tape or glue the four sides together to form a clear pyramid with the top cut off.

The hardware on current Android devices makes this physically impossible for several reasons:

When you download a holographic simulator app on Android, the software relies on visual illusions displayed on your screen rather than projecting light outward. Understanding the mechanics prevents realistic expectations from leading to disappointment. On-Screen 2D Simulations

If you strictly want to project images onto a wall from a mobile device, you need dedicated physical hardware.

“Your flashlight is boring. Upgrade it to a holographic projector in 1 tap. ✨ Download Holo Flash Projector for Android → [link]”

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If you want to use your phone to display content on a larger screen, there are three functional categories of apps actually available on the Google Play Store 1. Screen Mirroring & Casting Apps