A tangent simply is an area where two things in an image are nearly touching or actually touching, and in doing so create a visual mistake that the human eye doesn't like. It can lead to confusion in the viewer, like it can draw the eye to a part of the painting that's unimportant, it can just feel wrong or strange, or it can confuse the viewer as to the relative depth of the two objects. This lesson explains in more detail what a tangent is, and the best ways to fix them in your own artwork.
http://www.neilblevins.com/art_lessons/tangents/tangents.htm
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