Humans find symmetry more beautiful than asymmetry.
Flowers are symmetrical.
Standard caveats: There are more details, and that’s not a complete explanation, but it might prove a good starting point to look into if you’re curious about the explanation.
I think one possible “just so” explanation is:
Humans find symmetry more beautiful than asymmetry. Flowers are symmetrical.
Standard caveats: There are more details, and that’s not a complete explanation, but it might prove a good starting point to look into if you’re curious about the explanation.