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The inventor of the nondrying modeling days, variously called plastine, plastilene, or plasticene by their manufacturers and disrespectfully dubbed putty or mud by some people who use them, deserves a vote of thanks from every industrial artist. They are indispensable because they require little care, retain their shape indefinitely, and can be worked over and over again. To describe the material itself is hardly necessary since everyone who has ever been to kindergarten has handled it. Many, however, do not know that it can be obtained in several colors and varying degrees of consistency, For the use of pattern makers a brickcolored wax is made in consistencies so stiff that it has to be worked with instruments. A grayishgreen clay which works readily in the fingers, however, is usually preferred by sculptors and industrial designers. Clay studies are simply visualizations in three dimensions instead of two. The industrial designer is really