Color temperature is a good way to suggest form. Warm plays next to cool to create vibration and separation. Cool can recede and warm proceed towards you, except where other drawing tricks overcome these "rules." Note how the color temperatures, along with shading, create form on the trees in this pastel.
But wait, there's more! Form relates to the formal aspects of painting, which is our broader topic in these lessons. The form of an artwork is the piece in its rudimentary state: unified, visual, and independent of the meaning or context. Take away Norman Rockwell's narrative of a family at Thanksgiving (pregnant with meaning) and observe the way his objects work together to make a fine painting. These are the formal aspects, and the holiday sentiment is the informal aspect of this iconic painting.
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