Just learn now. But be aware that observational drawing is a different skill than illustrating your &quot;phantasy&quot; mental images.<p>In the second category, the engineer Elmer Sperry apparently had a serious facility for visualizing machinery, and would hold out a pen and paper to &quot;just draw a line around it&quot;. It&#x27;s mentioned in Eugene Ferguson&#x27;s book Engineering and the Mind&#x27;s Eye:
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