My daughter apparently thinks that there is an octopus living outside our upstairs apartment window. On three or four separate occasions she has sat backwards in a small rocker before the partially opened blinds and said, "ockopus."
"Huh?"
Pointing now, at an indistinct point in midspace, "Ockopus. Right there."
I actually squint, seeing only the shrubbery, a tree, some parking lot and an adjacent building. "Where, honey?"
Now, as if dealing with a brain-damaged person: "Right there."
"Yeah, okay. What is it doing?"
"Singing."
So - my adorable two-year-old girl's first imaginary creation that we're aware of is a flying, singing octopus that lives outside our window and is available for viewing (by the enlightened) in either rain or shine. It is also maybe huge, since it can be seen at distances far from our home, but always requires looking out of a window. So, a massive, airborne, singing octopus floats over my daughter wherever she goes. Take that, other kids' imaginary friends!