Why is Slinky part of toy history?

The "Slinky" was voted as one of the top one hundred toy inventions by members of the toy Industry .

"What walks down stairs, alone or in pairs, and makes a slinkity sound?

A spring, a spring, a marvelous thing! Everyone knows it's Slinky.

It's Slinky, it's Slinky. For fun it's a wonderful toy.

It's Slinky, it's Slinky. It's fun for a girl or a boy.

It's fun for a girl or a boy !"