Preliminaries is the first section of a book, and is usually the smallest section in terms of pages.
Book design is the art of incorporating the content, style, format, design, and sequence of the various components of a book into a coherent whole. In the words of Jan Tschichold, "methods and rules upon which it is impossible to improve, have been developed over centuries. To produce perfect books, these rules have to be brought back to life and applied." Front matter, or preliminaries, is the first section of a book, and is usually the smallest section in terms of the number of pages. Each page is counted, but no folio or page number is expressed, or printed, on either display pages or blank pages.
— What's an ideal font size for footnotes and is there any reason the footnote font needs to be smaller?
— For a footnote, for it to be used in-text, the writer found some content necessary to include with the manuscript, however less initially important than the main copy. Therefore, it is necessary for the main copy to have more hierarchy than the footnote.
Simplicity is somehow essentially describing the purpose and place of an object and product. The absence of clutter is just a clutter-free product. That's not simple.