[weird_user]

I think you misunderstood this. This is not an illusion of objects from different angles, but an unintuitive transformation of geometry.

[MattRix]

They didn’t misunderstand. If you look at the images included in the paper (this link has them inline: https://journalofillusion.net/index.php/joi/article/view/983...) you can see that it is an illusion that can be created with 3D printed objects.

[jameshart]

The linked STL is a different Kokichi Sugihara illusion - by the same creator as this new class of illusions, and part of a body of work in this field that this appears to be a continuation of.

https://en.wikipedia.org/wiki/Kokichi_Sugihara

[codeflo]

But it is. Those are objects that are mirror symmetric, and the apparent direction they're facing depends on viewing angle, creating the illusion that they haven't actually been mirrored.