Mindspace, or the design space of minds-in-general is the space of all possible minds. Eliezer Yudkwosky warned that mindspace is large and mostly filled with minds that are not human-like or even human-understandable. Indeed, humans largely failed to prefigure Simulator-AI, arguably the first region of non-biological mindspace that we've come into actual contact with.
quotes about mindspace
ey_trick_question People ask me, "What will Artificial Intelligences be like? What will they do? Tell us your amazing story about the future."
And lo, I say unto them, "You have asked me a trick question."
β Eliezer Yudkowsky, The Design Space of Minds-In-General