Defining Form Using Light and Shadow
Constructing form using light and shadows defines the perspective and draw the eye to the details in each drawing. Each form supports the center of interest in our drawing.
Different times of day and different light sources will effect the definition and sharpness of the shapes we are using. The forms in our picture area will direct us to the dominate form because the direction of light brings clarity to the center of interest. Light and dark work together in planes of vertical, horizontal and diagonal. The curve shape of light and dark will give the illusion of a three-dimensional shape on a two- dimensional surface.
To get the feeling of what I am talking about set up a display using a few objects and a lamp pointed directly on them. Notice the light and how it cascades on the forms you have chosen. Move the objects right, left far way and closer to your light source. Make a mental note or a rough drawing showing how the light effects the forms. The shapes and the way the light hits them are important they help emphasize and reveal the form.
A Strong Drawing
Remember that we must have a correct form to start with. Putting in the shadows will not correct a poor basic drawing. Our basic drawing must be able to stand as a sound form structure. We want to make sure that our light source is consistent on all the objects because building shadows is determined by the light source.
A solid form will make a great picture. Each element of our drawing should be followed through to the end. So knowing our basic forms and how the light brings them to life add depth to the perspective of the center of interest.