I never attended the 1982 World's Fair in Knoxville, so maybe it's impossible for me to have a worthwhile take on the topic. I do recall vividly the fair was supposed to present a variety of "new energy" displays which all mostly failed to work and the whole thing ended up being a drain on the electric systems (and a boon for TVA I suppose).
Up til now, the one memorable icon of the fair has been the so-called Sunsphere - forever linked to a rather hilarious episode of "The Simpsons", in which we learn the tower is a home to wigs and Bart and his friends knocked it over.
But now a piece of fair memorabilia is the desire of serious Pez collectors. The most sought after Pez dispenser in the world is the 1982 World's Fair version. Sources claim it could be worth $100,000.
It's up for auction now on eBay.
Sadly, the World's Fair pencil sharpener someone gave me has yet to be valued above, say, a nickle.