A 3D-printable hexagonal mirror array that reflects sunlight and allows you to write dot pictures and messages is open source. This article, originally posted in Japanese on 20:30 Nov 12, 2021 ...

3D images can be displayed through the reconstruction of light rays in various directions by displaying light source array images on an LCD panel for light-ray control.

But Array Labs, a two-year-old startup based in Silicon Valley, is also taking advantage of other technological developments in its quest to build a 3D map of Earth.