The Four Physical Arts from BL Harley 2637, f. 30v

Diagram illustrating the Four Physical Arts, the so-called Artes Quadriviales or Quadrivium, i.e. arithmetic, geometry, astronomy and music, decorated with a dog. Image taken from f. 30v of Institutiones (index Institutionum liber), Book I 'Oratio' (ff. 1-2v), Book 2. Written in Latin.