For no particular reason:
From my collection, 1939 New York World’s Fair memorabilia, “The World of Tomorrow”

One of the great things about the ‘39 World’s Fair is that many tons of every conceivable type of souvenur, keepsake, and knicknack were made and sold for it. These objects are still quite common and, therefore, commendably cheap.
It was the last world’s fair to have a traditional canival style midway, with rides and side shows.
It is also where my grandparents first encountered television. The fair’s opening coincided with the start of regular commercial television broadcasting in the US and the opening ceremonies were the official beginning. RCA set up a huge pavilion with several dozen TV sets, “see yourself” closed circuit displays, and a complete production studio. My grandmother didn’t think much of it. The set had a tiny, round black and white CRT screen that one observed in a mirror, it cost over $400 (an immense sum at the time) and you had to be within a mile or so of the transmitter to get a decent image. This was the year of Gone With the Wind and The Wizard of Oz on film. With its grainy black and white images, the electronic gizmo seemed like an over-priced novelty by comparison.