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Building a startup is like using a topographical map without the contour lines. Potential destinations appear nearby, but you can't judge the height of the mountains you need to climb to reach them.
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hmm... I think "point heights" are the term when the z coordinate is included (this was a primitive type of map before contour maps, when surveying data was captured in point to point form). I don't know a term for just x,y maps... as a graph that's just a scatter plot