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===== Comments by Tevian Dray in Fall 2015: =====

I used this activity on the first day of class in MTH 255H (multivariable
calculus).  It provided a nice introduction to representations of functions of
several variables, even though I only had 10--15 minutes.  I provided large
whiteboards, but the students didn't really use them.  The next class, I did a
very quick (5 minute) wrapup covering the first few questions only.  Despite
the rush, I felt the activity helped set the tone for the course.