caption: The image shows an open book with a drawing of a circle on it. The book is open to a page with text and a circle drawn on it, which appears to be a pentagram. The circle is divided into four sections, each with a different color and shape, and is surrounded by a thin black border. The text on the page is written in black ink and is likely a description of the pentagram, which is a mathematical equation used to calculate the number of protons and neutrons in a circle.