Indiana originally designed the image as a Christmas card for the Museum of Modern Art in 1965, more than a decade before it went to Philly. Since then, it has appeared on stamps, banners, rings and sculptures around the world.
This year it has been returned to its original color scheme: red, green and purple.
It was briefly removed in 1978 before the city decided it should have a permanent spot in its park, and then lifted away again here in 1999, for restoration.
Wye argues the sign often served as an "emblem of 1960s idealism," an iconic reminder of free love.
Whatever your feelings about Valentine's Day may be, one thing's for sure: There's just a little more LOVE out on display today.
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