You can turn your smartphone into a 3D holographic video viewer with this simple DIY project presented by Youtuber Mrwhosetheboss. When paired with a special “hologram-ready” video, this device will create the illusion that you’re observing a floating 3D image!

All you need is an old CD case, a sharp knife, some tape, a pen, a ruler and graph paper. The videos that make use of this device play the same video from four directions, and when these are reflected in the panes of your new device, it looks like a floating 3D hologram!

Unfortunately, this illusion is not a true 3D hologram – it still uses 2D images/videos to create the effect, while a true hologram recreates a 3D object and, with current technology, requires the use of split laser beams.

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The DIY video on Youtube: