This year marks the 60th anniversary of Colorforms, those flexible vinyl stick-ons you can position on graphic backgrounds.

Invented by Harry and Patricia Kislevitz in 1951, Colorforms is one of the oldest and best-known brands in the toy industry (Popeye was the first of many licensed characters) with more than 1 billion play sets sold, according to University Games, the brand's owner.

A simple concept, it has evolved over the years as a toy that included games, puzzles and interactive books.

To mark the occasion of its anniversary, University Games has released a collector's edition play set as well as re-released the 1984 Michael Jackson-themed "dress-up" edition.

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