These drawings were made on pages 46 & 35, and pages 54[?] & 61 of a book on astronomy by Joannis de Sacro Bosco, Sphaera, Lyon France, 1564. The original pages were perforated by termite holes that were filled with gold leaf. The pages themselves have engravings and marginalia that Macia has incorporated into his new images. The upper drawing depicts Macia's conception of the Tower of Babel. -- Source of annotation: Marvin or Ruth Sackner.