I keep this on the tutoring table in the math office so the kids know I’m not playing around. (it’s actually very useful when doing geometric constructions)
@futurebird off topic, but that pen takes me back 20 years!
I used to have one that looked like that, it's that an old one? Or are they still made?
(It's a plastic version of a technical drawing pencil, don't know how they are called in English. Right?)
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