库斯·埃森是代夫特理工大学的副教授，主讲工业设计工程的徒手绘图能力课程。
Koos Eissen is an associate professor at the Delft University of Technology and teaches freehand drawing classes at the Faculty of Industrial Design Engineering.
景观设计效果图起源于徒手绘制的设计方案。
Landscape design renderings originated in hand-painted design.
原来典型的工业设计就是应用艺术造型设计，它对设计师所要求的主要是材料知识、造型能力、徒手绘图能力、绘画能力和渲染能力。
Classical industrial design is a form of applied art, requiring deep knowledge of forms and materials and skills in sketching, drawing, and rendering.
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