Kwesi mentioned triangulation of data in his research talk this evening. He and I pointed out that, although the image of a triangle has three corners, triangulation can be done with two or more sources, methods, etc. Here is a link with a bit more detailed information in the concept of triangulation in research.
The metaphor of triangulation comes from trigonometry and surveying, where measuring a side and the two contiguous angles of a triangle can give you all the rest of the information about that triangle.
The importance of observing things from several points of view is illustrated by this optical illusion video -- and this silly video about a magic trick. Things are not necessarily what they appear to be at first glance, and a new point of view is what allows you to see the contradictions that point to the truth!
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