I think this idea is good in that people are very likely to see the messages you are writing/questions you are asking them. A lot of people look at the ground when they walk, and everyone has to walk somewhere on campus.
The only problem I see with it is that chalk is very temporary. You would have to check back in each spot possibly every day or every couple days. I also think that there wouldn’t be enough room on the sidewalk for someone to write what they think about their major.
It’s a good idea for communicating, I just don’t know how much information you’d get out of it.
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