[3] The idea of the attraction goes as far back as 1957, when Walt Disney introduced a concept for an atomic-themed exhibit in Tomorrowland on the Disneyland television show episode, Our Friend The Atom.
A newspaper profile in 1957 said that Disney was planning a ride to take guests inside a microscope, in order to promote science education.
[1] The Disneyland Imagineers began with the idea of examining Monsanto's polymers, but decided that those molecules were too complex to explain.
Instead, they settled on the idea of exploring a molecule of water, which was easy for guests to understand and relate to.
[7] The attraction was designed to simulate humans shrinking to a size smaller than an atom (the "inner space").
The other end of the Monsanto Mighty Microscope had a glass tube in which the supposedly miniaturized riders could be seen moving through.
[3] Upon boarding their 'Atommobiles', riders were greeted by the voice of an unseen scientist (Paul Frees) who explained: "I am the first person to make this fabulous journey.
As they continued to shrink, the narrator exclaimed, "I am passing beyond the magnification limits of even the most powerful microscopes.
The snowflakes took on a crystalline form, eventually becoming large enough to cover the entire field of the riders' vision.
As the travelers continued to shrink, the molecules became larger, and took on a peculiar Mickey Mouse shape.
As the Atommobile entered the atom, a storm of lights flashed past on all sides at impossible speeds.
Suddenly the frenzy of the electrons passed, and the riders found themselves in a large, empty space, surrounded in the distance by a sphere of slow-moving lights.
The riders then began the return journey to full size, but were soon greeted with the sight of water molecules swirling rapidly.
Having returned to normal size, the riders disembarked and passed by displays of Monsanto's advances in material science before exiting the attraction building.
[3] Like many of the WED Enterprises attractions of the 1960s, such as It's a Small World, the Carousel of Progress, and the Enchanted Tiki Room, Walt Disney assigned his staff songwriters, the Sherman Brothers, the task of writing an opening and closing song for the Adventure Thru Inner Space attraction.
That song was Miracles from Molecules and bridged the ride message of adventure with the Monsanto company's mission statement.
In the Marvel Cinematic Universe-themed Disney Wish family dining experience Avengers: Quantum Encounter, Scott Lang and Hope van Dyne host a demonstration of Pym Particles called "Miracles From Molecules," featuring a new instrumental version of the song.
Finally, the Monsanto "Fountain of Fashion" that dripped oil down strings tightened to it was replaced with a series of sculptures that looked like two plates put together with a snowflake on them.