Perspective is still at play. At arms length, on my phone, if I make it so the flat surface is completely aligned with my center of vision, the bottom side covers at least 1mm of whatever is on the underside. The closer one gets to the phone, the more pronounced the effect.
The video keeps triggering my sense of seeing CGI, but the hiding effect on display can absolutely be accomplished in camera.
The video keeps triggering my sense of seeing CGI, but the hiding effect on display can absolutely be accomplished in camera.