3. The Rock-a-Stack
Release Year: 1960Producer: Fisher-Price
Initial Cost: $1.29*
With the Rock-a-Stack, Fisher-Price introduced playtime to a new level of simplicity and skill development in 1960. This bright stacking toy, which cost $1.29, tested children's fine motor abilities and wits.

Imgur/Rock-a-Stack @thewarehouse
Early childhood development was fundamentally impacted by the delight of stacking rings in different configurations, and for those who constructed their first towers with the Rock-a-Stack, the experience left enduring memories.
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Clear logic. Any edge cases?