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
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."
— Eliezer Yudkowsky, The Design Space of Minds-In-General