Creating contour maps in Calc III - multivariable calculus

I just saw this blog post, and think the images that look like contour maps would be useful in class.  Maybe have the students create them using foam board.  Create hillscapes with multiple peaks and valleys. I couldn't find a name on the blog post or I would give credit to the artist.  Also, the link saying where the images were taken from did not work (404).


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