i guess the imagination is infinate in some sense, but our senses kinda control the way we view things, ie say we were immortal, couldent feel pain and couldent hear, we could talk we could see and communicate with each other we could smell and taste, our whole perspective of everything would be so much different than it is now, its near impossible to comprehend how a complete other lifeform would imagine or function inside its own head, its interesting to see how human thought would vary from the thought of something with equal intelligence but seeing things through different senses slightly.