"Three cats in a trenchcoat" is a good one. Three cats in a trenchcoat standing on each other's shoulders, pretending to be a human, Vincent Adultman style.
You can get them standing side by side wearing trenchcoats. You can get a cat pyramid or a cat totem or a stack or tower of cats (though often the ability to count to three is then lost). You can't get them to share the trenchcoat. Nothing like that occurred in any training set, and the AIs do not understand spatial relationships between objects ("X is on top of Y, inside Z") so you cannot describe how to arrange the things it does know about in the scene. Dall-E won't do it. Midjourney won't do it. Stable Diffusion won't do it.
Eventually, enough images will be seeded into the training sets for this to stop being a useful test. But right now, it gives one a fascinating window on what happens when you try to extrapolate outside the cloud of thingspace described by the training data, rather than just interpolating within it.
You can get them standing side by side wearing trenchcoats. You can get a cat pyramid or a cat totem or a stack or tower of cats (though often the ability to count to three is then lost). You can't get them to share the trenchcoat. Nothing like that occurred in any training set, and the AIs do not understand spatial relationships between objects ("X is on top of Y, inside Z") so you cannot describe how to arrange the things it does know about in the scene. Dall-E won't do it. Midjourney won't do it. Stable Diffusion won't do it.
Eventually, enough images will be seeded into the training sets for this to stop being a useful test. But right now, it gives one a fascinating window on what happens when you try to extrapolate outside the cloud of thingspace described by the training data, rather than just interpolating within it.
https://www.toothycat.net/~sham/trenchcoats