I remember from my school days Archimedes jumping into his bath and displacing water and coming up with his famous principle, and of course Isaac Newton being hit on the head with an apple. In other words, this realm of human knowledge - which is mathematical, essentially - can have a playful visual element to it.
America is known as a country that welcomes people to its shores. All kinds of people. The image of the Statue of Liberty with Emma Lazarus' famous poem. She lifts her lamp and welcomes people to the golden shore, where they will not experience prejudice because of the color of their skin, the religious faith that they follow.