This is a wooden pattern for laser cutting that works like the Antikythera mechanism. Each image is 25cm in size, and requires a lot of 5mm wooden rods. There is also an explanation for each image. You will also need nested rods of sizes 5 mm, 6.67 mm, 8.33 mm, and so on until 18.33 mm. This was originally designed for 3mm rods (and 1.5mm wood thickness) instead of 5mm, so you get these strange thirds in rod sizes. The stl file is for reference.
The author marked this model as their own original creation.