This Fisher-Price® Rock-a-Stack® toy, made from plant-based materials*, offers classic stacking fun for babies. It features a wibbly-wobby rocker base and 5 colorful rings for little hands to grasp and stack.

It helps teach them stacking, colors, different sizes and coordination. It is easy for younger babies to grasp and carry around. The top donut is perfect for babies since it has little beads and rattles.

Stacking helps baby develop hand-eye coordination and introduces them to the concept of relative size as they learn to sort and stack from biggest to smallest! (*Toy made from a minimum of 90% ethanol extracted from sugar cane.). Brief content visible, double tap to read full content.

The original Rock-a-Stack was introduced by Fisher-Price in 1960 and featured six colorful rings. A year later the Giant Rock-a-Stack was introduced with ten colorful rings. A 1964 Sears Christmas catalog list price for the toys were . 77¢ for the Rock-a-Stack and $1.64 for the Giant Rock-a-Stack.

Product information

Fisher-Price While Ernest Thornell was the Fisher-Price designer of this 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 Norman Rockwell) for Holgate Toys.

In general, stacks are useful for processing nested structures or for functions which call other functions (or themselves). A nested structure is one that can contain instances of itself embedded within itself.

In computer science, a stack is an abstract data type that serves as a collection of elements, with two main operations: Push, which adds an element to the collection, and. Pop, which removes the most recently added element that was not yet removed.

Calling this structure a stack is by analogy to a set of physical items stacked one atop another, such as a stack of plates. The order in which an element added to or removed from a stack is described as last in, first out, referred to by the acronym LIFO.

Fine motor skills Stacking toys are great for developing those, since picking up and putting objects in place train the child's hand muscles and muscle control, intentional grasp and release skills, as well as how to control and position their fingers.

1960 Since the introduction of Rock-A-Stacks in 1960, over 40 million have been sold.

1960 History. The Rock-A-Stack was made in 1960, and since then, over 40 million have been sold. The stacking rings is a white base with a yellow pole and it comes with 5 or 6 colored rings.

The stack data structure is a linear data structure that accompanies a principle known as LIFO (Last In First Out) or FILO (First In Last Out). Real-life examples of a stack are a deck of cards, piles of books, piles of money, and many more.

(slang, chiefly UK) To fall over; to topple.

Stack is a linear data structure that follows a particular order in which the operations are performed. The order may be LIFO(Last In First Out) or FILO(First In Last Out). LIFO implies that the element that is inserted last, comes out first and FILO implies that the element that is inserted first, comes out last.

A stack (sometimes called a “push-down stack”) is an ordered collection of items where the addition of new items and the removal of existing items always takes place at the same end. This end is commonly referred to as the “top.” The end opposite the top is known as the “base.”