Widget

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



Tooltip

Door lock at Hotel Blake, Chicago



Fixed layout

Raised ring in cup lid keeps stacked cups from slipping



Related posts: Interfaces IRL

Forcing function…

Animal Hospital with separate dog and cat entrances, Berkeley, CA

WYSIWYG…

Wallaby Yogurt container: Clear container lets the color and texture of the contents “create” the label



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Fair warning
Progress bar
Fruit 2.0