How do I explain the concept of an atom to someone in the 16th century?

Question

I need to write a two page essay describing the composition, purpose, and looks of an atom to an average 1500's citizen. Needs to be simple enough for them to understand, and perhaps involve some of the scientific beliefs regarding elements at that time. I cannot think of a way to describe an atom to someone who does not understand the concepts of electricity, gravity, and microscopy.

Answer 1

Start off with reasoning similar to that the ancient Greeks used to explain the same concept in the 5th century B.C.

Answer 2

I would use pictures, drawings and diagrams to back it up by showing how one thing turns into another in everyday life, similar to radioactive decay.

I might also use the moon circling the earth as an example of the similarities between the "little worlds" and the "big worlds."

Answer 3

As something so small that it makes Bill Clinton's penis look as big as a whale.