None of them are impossible though, they're just fancy, intricate objets d'art.
…that’s exactly what I thought… some of them could even be reproduced on a 3D printer if someone was skilled enough methinks!… so is AI’s concept of ‘impossible objects‘ purely based on ‘intricate visual patterns’ rather than actual solid objects?… here’s what it says on Wikipedia…

…here are some examples…







…so the AI doesn’t quite grasp the definition of ‘impossible’ it seems?…hmmmmmm!… interesting… cheers.