Well... It's not MANDATORY by any means. It's a part of being professional in manner for some classes, and so you must improvise.
We're finishing up a society class, 2nd year, where we had to build a rube goldberg machine (youtube it) and we had to go and spend like, $100 as a group on random stuff like pulleys, cups, string, wire, paint, mouse traps, rat traps, funnels....... We weren't told that these materials were prereq's for the course: It was required in a project, and so we did it.
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