Colors 

House of Leaves includes frequent and seemingly systematic color changes. While Danielewski leaves much of the interpretation of the choice of colors up to the reader, several distinct patterns emerge upon closer examination. 

Notable examples include:

• The word "house" is colored blue (gray for non-color editions of the book and light gray for red editions). In many places throughout the book, it is offset from the rest of the text in different directions at different times. Foreign-language equivalents of house, such as the German Haus and the French maison, are also blue. These colorizations even extend to text on the book's copyright page.
• In all colored editions, the word minotaur and all struckthrough passages are colored red.
• Many references to Johnny's mother are colored purple.

Font changes 

Throughout the book, various changes in font serve as a way for the reader to quickly determine which of its multiple narrators’ work they are currently following. In the book, there are four fonts used by the four narrators. These are: Times New Roman (Zampanò), Courier (Johnny), Bookman (The Editors), and Dante (Johnny's mother). (Additional font changes are used intermittently—Janson for film intertitles, Book Antiqua for a letter written by Navidson, and so on.)