By Olivia B. Waxman
August 3, 2015

A YouTube channel that dishes out technology advice “Mrwhosetheboss” appears to have a strategy for turning smartphones into 3D hologram projectors that involves a plastic CD cover, a glass cutter, a sheet of graph paper, some tape, and a pen. The video has racked up more than 2.3 million views in two days.

Other YouTube users have posted tutorials about this trick before, but this clip has just become the most popular on the video-sharing website. Inventors have even tried to crowdsource a gadget that turns iPads into hologram projectors.

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