Check out OP's post history: There's at least a brief description in one old post:

I opened up an old Canon flatbed scanner and more or less removed anything that wasn’t the sensor or the mechanical assembly pulling it along. The optical assembly is hacked together with black foam board, an acrylic magnifying glass and too much gaffers tape.

Think of it as a pinhole shoebox camera with a scanner at the back, instead of photo paper or film.

So it's a scanner, but it's highly modified into a camera.

Also worth checking out OP's other posts. It's all pretty neat.

I love this one! And the title (dual meaning: "weather" and "to be") works great. Works equally well whether you see three hands gripping each other or a tree struggling to stay upright, presumably torn by the elements.

Edit: Here's a comment containing a picture of the camera and some information about the process!