Hacker News Reader

It's actually more like a victorian stereograph, an idea from about 150 years ago.

Related: The Fisher Price Viewmaster

Fisher Price should release a version that takes a smartphone instead of a picture disc.

or maybe one with a USB port or SD slot.

Eh. Only if you want the price of that Fisher-Price VR viewer to jump from $20 (plastic housing and a couple of lenses/magnets) to $500.