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This comes a simple idea, where is your pen?
On your ear? in pocket? on the table away from you?
Or...it can be just in the tool.
you can use it to mark easier and don't need to look for your pen, but hold object more stable to make a accurate line.
National Cheng Kung University
Industrial Design
Tainan, Taiwan
Prof. Liu
National Cheng Kung University
Department of industrial Design
Shiao, Cherub
Taichung, Taiwan
Cherub Shiao & Tsuen Shin Wu