Cross-Sections of Form.
Another method to analyze the planes of a complex form is to imagine a vertical cross-section of the
form. When you have a three-dimensional understanding of an object, the rendition of the object is
more convincing.Imagine slicing an object into vertical sections. This would create cross-sections of the object when you view these slices from
the sides. Instead of actually slicing up the object before you begin to draw, you can obtain a conceptual understanding of an
object’s cross-section by moving around the object and studying the object from various angles.
Study, by Dean Fisher