There is no fixed physical reality no single perception of the world just numerous ways of interpreting world views as dictated by one's nervous system and the specific environment of our planetary existence.
Why does the lizard stick his tongue out? The lizard sticks its tongue out because that's the way its listening and looking and tasting its environment. It's its means of appreciating what's in front of it.
Why should we think upon things that are lovely? Because thinking determines life. It is a common habit to blame life upon the environment. Environment modifies life but does not govern life. The soul is stronger than its surroundings.