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During the 2008 Presidential election, colored cherries at this
Minneapolis airport bar let you indicate your political affiliation



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Door lock at Hotel Blake, Chicago



Fixed layout

Raised ring in cup lid keeps stacked cups from slipping



Related posts: Interfaces IRL

Latte, with sticker to cover lid hole, Tokyo

I can’t read what the green sticker says, but perhaps it’s to prevent spillage or being burned by hot steam. Maybe it’s for sanitation, to keep the drink sealed until you are ready to drink it?

One use case for a “to go” cup is to take the drink from the counter and consume it immediately. But if you are shopping for others to drink later, or it’s too hot to drink later, how to manage the drink during that transition where it’s in your possession but not being consumed? The sticker lives in that ill-defined period of time.