The original painting series of Professor Preecha Thaothong, is the art works has been created in the theory of light and heavy light and shadow which is a specific format of him that expresses the weight of the picture from light to dark conveying the emotion and feeling along with lines using in the depth perspective creation, and overlapping causes illusive distance in the image, relies on the theory of elements the of light and shadow that he had defined. In each work there will be differences in detail.