HFF Fourth Rock is based on Mars Bounce from page 83 of "Brushstroke and
Free-Style Alphabets: 100 Complete Fonts" by Dan X. Solo. Mars Bounce is also featured on page 92 of "The Solotype Catalog of 4,147 Display
There is this TV program that refers to Earth as the "third rock from the sun." If Earth is the third rock... then Mars is the fourth rock.
And that is how the font got its name.
