Are we imaginary? When I say, "humans are imaginary in the same sense that the Big Dipper is imaginary," I mean that humans are imaginary in the same sense that I have described the Big Dipper as imaginary. In other words:
Through an act of imagination, one can draw a boundary around a particle formation and call it the “a human.” Humans do not inherently exist; rather, "a human" is merely a concept that requires an act of imagination. If all life in the universe suddenly died (or alternatively, if humans stopped imagining), then there would be no one to draw the boundaries around humans, and therefore humans would cease to exist. The concept of humans can only exist in living minds. In this sense, the humans are imaginary.
Plus, it just might be the case that the Big Dipper is conscious. See, panpsychism.