If you, like me, are one of today's lucky ten thousand[1], here's some context:

Kokichi Suhihara is an engineering professor who designs 3D objects that create optical illusions, including their mirrored images. Here's his English home page:

http://www.isc.meiji.ac.jp/~kokichis/Welcomee.html

So we're looking at a photo of an actual 3D object and its mirrored reflection, which should obviously appear incorrect since, well, the reflection is not apparently mirrored but rather facing the same way as the real object. I think the key to understanding what we're seeing is that the non-mirrored image is also not as it appears. We'd need to see it rotated to understand the actual shape.

Here's a short YouTube video of his "Ambiguous Garage Roof" that I've now watched several times and it keeps blowing my mind:

https://youtu.be/KtA6u1HIqbg

[1] https://xkcd.com/1053/