I don't think it's impossible for these images to have some resonance with human dreams and altered states of consciousness. However, the phrase "mental imagery of alien minds" seems to carry unjustified conceptual baggage.
The usual implication of "mind" is something like a process that includes intentions, meta-understandings and etc (varying depending on one's conceptions but usually having these). The processes that generate things could be described as purely algorithmic - or they might have further implications. But the thing there's no proof or even strong indicator of the further implications.
The usual implication of "mind" is something like a process that includes intentions, meta-understandings and etc (varying depending on one's conceptions but usually having these). The processes that generate things could be described as purely algorithmic - or they might have further implications. But the thing there's no proof or even strong indicator of the further implications.