Donald in Mathmagic Land1959

The True Spirit of Adventure:
The mind knows no limits when used properly. Think of a pentagram, Donald. Now put another inside, a third, and a fourth. No pencil is sharp enough to draw as fine as you can think, and no paper large enough to hold your imagination. In fact, it is only in the mind that we can conceive infinity. [the infinite progression of pentagrams turns into a hallway of doors] Mathematical thinking has opened the doors to the exciting adventures of science.

Donald Duck:
I'll be doggone! I've never seen so many doors before.

[Runs back and forth from one door to another]

The True Spirit of Adventure:
Each discovery leads to many others. An endless chain.

Donald Duck:
Hey, hey! What's the matter with these doors? Hey! These doors won't open! They're locked!

The True Spirit of Adventure:
Of course they are locked. These are the doors of the future, and the key is...

Donald Duck:
Mathematics!

The True Spirit of Adventure:
Right. Mathematics. The boundless treasures of science are locked behind those doors. In time, they will be opened by the curious and inquiring minds of future generations. In the words of Galileo, "Mathematics is the alphabet with which God has written the universe."