Interestingly, we humans do literally have to learn to see, including updating our preferences about where to rotate our eyeballs.
Also interestingly, we perceive nothing directly. The role of sense organs is to rule out possibilities. So everything that remains must be internally generated (i.e. conjectural). Before we can see something we must first have an idea about it, and all such ideas come from guesswork.
When we observe correctly we can say that the internal perception corresponds to external reality.
Another property of humans is that our perceptions are distorted by strong emotions such as fears and desires. Overly ambitious people, for instance, perceive the world differently. I wonder whether this goes all the way down to the level of apples and oranges (e.g. not seeing an apple if it is not in my 'interest' to do so).