Seeing Form
The standard requirement for seeing in three dimensions is two eyes and a brain. Each eye sees a slightly different view and the mind merges these views together to create an illusion of form. But there is so much more than that needed to see form,and also somewhat less. When you add movement to the equation you increase greatly your ability to perceive form (and space).So much so that using only ONE eye and adding movement gives a greater understanding of form than two eyes without movement.
Would it be possible to see in three dimensions without a body? From an evolutionary point of view the sense of touch precedes the sense of sight. The sense of taste might be next after touch, since it is in a way a refinement of touch. The sense of smell may have come next for the same reason.I'm guessing hearing comes next since hearing is the touch of vibrations from a distance. The last innovation I believe is sight. For humans, sight has become such a powerful tool that we may forget how much our seeing is dependent on our other senses.
What would seeing be without touch? We can look at something and guess whether it is hard or soft,light or heavy or edible or not. Could we
"see" these things if we never touched them? Or never tasted them?
Seeing form is dependent on movement,on our other senses to various degrees,our brains(including memory)and only then can we, with our vision put this all together to begin to see and think spatially.