Can you tell which of these artworks was created by a computer?

Take a look at the four paintings on this page. If you are acquainted with modern art, you will probably assume, at a quick glance, that it shows four works by the Russian artist Wassily Kandinsky (1866-1944). However, whatever your knowledge of modern art, I suggest you look again, because not all of these works are by that great pioneer of abstract painting. More than one of them is an original image created by a computer model, which was asked to do a digital artwork in the style of Kandinsky.

Which are the fakes? I’ll give you the answer at the end of the article. Before we get there, you need to know how a computer can make such startlingly echoic images, and what it might mean for art.

This story begins with ‘GPT1’ (the initialism means ‘Generative Pre-trained Transformer’). Launched on the world in 2018, GPT1 was a computer model created by a company called OpenAI (part-funded by Elon Musk and closely associated with Microsoft).