They've built a glasses-free 3D projector that uses two liquid crystal modulators to angle outgoing light and present different images (eight in the prototype) depending on your point of view.

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Solar Glasses, Pinhole Projector A Must To Safely Watch Eclipse. August 19, 2017 / 2:27 PM PDT / KCAL News ... You can look indirectly with a pinhole projector that you can make yourself.

Here's where to buy solar eclipse observation glasses in Bucks County, and how to build your own projector ahead of the solar eclipse on April 8.

To make a pinhole projector, you really just need something with a pinhole in it and something that will project an image. You could use two sheets of printer paper, card stock or even paper plates.