I am afraid of my visions.” Thus spoke H.R. Giger, the artist whose paintings led to him being engaged by director Ridley Scott to design the xenomorph for the first Alien film in the late 1970s.

With A.I. God being the first artwork by a humanoid robot ever to be sold at auction, many see this sale as the dawn of AI’s full-fledged entry into the art world. Others, however, worry this is ...