More examples of advantage
Make a mold once and cast repeatedly
Set up a jig once and machine repeatedly
(Photo)Lithography: Create a (photo)mask and print with it repeatedly
IKEA fastenings - 8 x standard shelf support, 32 x standard screw
Kirigami: fold paper, cut once, unfold to reveal several identical/symmetrical forms.
Counterexample: paint every petal individually
SIGPLAN / interpreter design pattern