mater et magistra has created a pdf file of Lesley Payne's great article on math, "Poetic Math," found in a past issue of Heart and Mind Magazine. The issue date is not mentioned. You can find it here. For those who can't read enough books, there are books listed at the end of the article. This is not a complete list of books by Theoni Pappas.
Archimedes and the Door of Science (Living History Library) by Jeanne Bendick
The Joy of Mathematics: Discovering Mathematics All Around You by Theoni Pappas.
More Joy of Mathematics: Exploring Mathematics All Around You by Theoni Pappas
The Adventures of Penrose the Mathematical Cat by Theoni Pappas
Further Adventures of Penrose the Mathematical Cat by Theoni Pappas
Math For Kids and Other People Too by Theoni Pappas
Fractals, Googols, and Other Mathematical Tales by Theoni Pappas
Mathematical Footprints: Discovering Mathematics Everywhere by Theoni Pappas
Mathematics Appreciation by Theoni Pappas
Math Talk: Mathematical Ideas in Poems for Two Voices by Theoni Pappas
The Magic of Mathematics: Discovering the Spell of Mathematics by Theoni Pappas