ELI5 Ferris Wheels - what inspired George Ferris to invent it?

What inspired George Ferris to create the first Ferris wheel at the Chicago World’s Fair in 1893? How tall was the original Ferris wheel, and what impressive structure did it aim to surpass? What unique challenges did engineers face to build the Ferris wheel, and how did they ensure its safety?

... we explain like I'm five

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