Among the factors that determine the affective value of any visual presentation (such as color, subject, balance, light and shade), line forms have occupied an important position in the opinions of writers on Aesthetics. Cox 1 says • Straight lines will always express rigidity and stiffness while curves will express some sort of growth or motion The vertical line is a line of stability, of strength and vigor .... All these characteristics of lines may be the result of association or they may have some deeper reason, but they are there, in the lines themselves, without regard to what the lines may be used to represent, and are the most valuable means to artistic expression.
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