I don't think the same artist did all these cards.

What is this supposed to be? A brain, rising from the tree canopy? The card describes it thus:

Colorful exhibits, in a garden atmosphere, present interesting and entertaining explanations of computers and other modern information-handling devices. The main attraction is where 400 spectators at a time will be lifted by hydraulic machine into the "Information Machine".

Take a look at the area off to the right of the middle. They were bleachers. Click on the video to see what happened next.

The building was by Eames and Saarinen, which explains a lot. A period film on its construction can be seen here.