an Excellent point. overcoming the physics needed to casually travel the stars would denote a extremely advanced society. Your Ant Analog is a good one. Assume you have an ant colony in the middle of an empty field. you walk past that ant hill. you might look down and think "hmm, look at those busy ants" then go about your way. meanwhile the ants are asking themselves "there is lift outside this anthill why hasn't it visited us and introduced itself?"The Fermi paradox raises another, more ominous thought, IMO. Perhaps interstellar travel is prohibitively expensive, or, so demanding we would appear about as interesting as an ant colony to any who had mastered it.