What is a word or phrase that expresses the idea of purposely making something seem better by comparison? For example, lemon Starburst was created to make the cherry flavor seem that much tastier.
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The name for something that is used to make something else look different by comparison is a foil:
The presence of a foil induces a cognitive bias known as a contrast effect.
I'm not aware of any terms that mean to create a foil or to induce a contrast effect.
You can say something like: "The lemon Starburt was created to make cherry flavor seem tastier by comparison."