Using dark print on a light background best demonstrates which design principle?

Using dark print on a light background best demonstrates the design principle of contrast.

In a very basic definition, contrast is the degree of difference between two elements of your design.

Contrast has a great effect on readability and legibility as well, while low contrast not only reduces the difference between elements, it also decreases readability.

- "he is a very real person and his intent isn't to influence us vonnegut addresses this towards the end of the letter when he says, if we choose to curse, that is by our own individual means."