These objects are also able to retain properties of the types we perceive them as having, even when they are not being perceived. Their properties are perception-independent. By means of our senses, we perceive the world directly, and pretty much as it is. In the main, our claims to have knowledge of it are justified. Nevertheless, these beliefs have been called into question by philosophers who have thought about them systematically.
Naive realism looks pretty unsophisticated.
If we had compound eyes, as flies do, we would receive information about the visual world in a completely different form. If we had jaundice, things would look yellow. Even our current perceptual apparatus is obviously not infallible. We are all familiar with perceptual illusions of various sorts. This is a more radical case of perceptual error than simple illusion.