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color progression. The Rock-a-Stack is designed to teach young children about colors and to help them develop their hand-eye coordination and shape perception. Since the introduction of Rock-A-Stacks in 1960, over 40 million have been sold. While Ernest
Thornell was the Fisher-Price designer of this
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toy (from a phone conversation on 8-31-16 between Ernest
Thornell and Eric Smith), the Rock-a-Stack is stylistically similar to the earlier Rocky Color Cone wooden stacking toy designed in 1938 by Jarvis Rockwell (brother of
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As of 2020, Fisher-Price offers the toy in a giant version, a 15-inch (38 cm) tall exact copy of the regular version. The giant toy also has six rings, including the top red/clear ring/rattle with three rolling balls
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with colorful rings that have to be placed in order of size onto a tapered pole mounted on a rocking base. When stacked correctly the hollow plastic rings follow
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From 1980 to 1989, the number of rings was reduced to five, the color order on the remaining rings was reversed and the color purple was no longer used.
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From 1960 to 1979 the toy was released with six rings, colored in the order of (largest to smallest) red, orange, yellow, green, blue and purple.
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Beginning in 1990, the number of rings remained at five but the color order was again reversed to the original minus purple.
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Until 1966 the Rock-a-Stack was made with a painted wooden base rather than the all-plastic construction of later versions.
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weightlessness toy experimentation due to the lack of time to perform safety tests prior to the March 1985 launch of the
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from 1962 until the factory's closing in 1990 when production was moved to other facilities in
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The Rock-a-Stack was produced at Fisher-Price's production facility in
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