Tutorial 149 - The Rib Cage (Patreon)

These illustrations show how a simplified 3D shape represents the complexity of the rib cage fairly accurately. 

When conceiving of the rib cage as a basic shape, we should focus on the size and placement in the torso, and where the plane changes occur. This will help greatly when constructing a drawing of the torso. 

Observing the costal cartilage and sternum, these areas should be considering as one basic plane, forward facing. As we move out to meet the ribs there is a plane change (note the edge). The ribs turn and direct upwards as they continue to curve into towards the centre, finally meeting the backbone (spine). 

Draw the rib cage in as many angles as possible, focus on the basic 3D shape first and add details only when the size and position feels correct.