What allows Abstract Paintings is the understanding and reflection of strength. Every factor in space has different strength, which can be showed in painting by grayscale and all the greyish colors between. In exercise, artists can communicate types by juxtaposing areas of different intensity; by using just shade (of the same intensity) one can only signify representational types. Thus, the primary indicates of Flower Oil Paintings are unique from ideological indicates, such as geometric numbers, various opinions and company (perspective), and signs. In specialized drawing, width of line is also perfect.
