Let’s look closer at how intelligence might evolve in a five-eyed creature such as Opabinia. Our eyes are now understood to be extensions of our brain, like visual coprocessors. Vision is part of our intelligence; fundamental to how we see the world.
Is our binocular vision the reason we tend to divide the world into two parts, yes or no, on or off, right or wrong? Would an alien life form, like an intelligent Opabinid, see the world as pentameral? What would it be like for us to attempt communication with a pentameral being?