A smaller picture, map, or text placed within or beside a larger one, or to place something as an insert.
From 'in' + 'set', meaning literally 'set in'. First recorded in the 17th century, originally referring to something inserted or embedded within something else.
Insets are like windows within windows - they solve the fundamental problem of trying to show both the big picture and crucial details simultaneously. Maps use them brilliantly, showing you the entire country while zooming in on the dense, important bits that would otherwise be illegible specks.
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