3 ms·

Thanks. Can't seem to find how they work exactly except for "with mirrors!" remarks :)

• krm01 6y ago
  Spherical mirrors and fisheye lenses do the trick.
• fragmede 6y ago
  Once you know something is possible, it becomes dramatically easier. :) Current generation non-laser short throw projectors may already hit the price/performance you need, just mount them so they face the ceiling, on top of a bookshelf. (Laser projects are still quite expensive.) If they don't, then physics, specifically optics, has the equations to calculate the mirror specifications you need for your exact use-case. Custom-made mirrors aren't the cheapest, but what you're asking for sounds possible, though it's impossible to say without more information, specifically the dimensions and the brightness needed - you'll lose a lot of brightness from the mirrors. The setup for Fishbug was two projectors facing a hemispherical mirror. https://www.youtube.com/watch?v=ThtF-FY28hM https://www.youtube.com/watch?v=ThtF-FY28hM