Nautilus Shell Spiral in a Round Glass Medallion Coloring Page

A nautilus shell fills a round medallion, cut away to show the spiral of chambers inside it. The chambers wind in from a tiny knot at the middle and grow steadily larger as they turn outward, each one a separate closed cell divided from its neighbor by a curved wall. At the very center the divisions crowd together into a tight rosette barely wider than a fingertip.

Around the shell runs a ring of trapezoid border cells, regular and evenly spaced, held between two heavy concentric circles. That band is the only straight edged element on the page and it frames the spiral cleanly.

This is the sheet to reach for when you want a single idea done well. Because the chambers grow in an orderly progression, a graded palette does the work for you. Start deep at the center and lighten with every turn, or run a full spectrum round the spiral and let it resolve at the outer edge.

The border ring wants one flat tone or a simple two color alternation so it stays quiet. Work from the middle outward, because the central chambers are tiny and much easier before your hand is tired. A sharp pencil at the core, markers once the cells open up. About thirty five minutes.