This is how I know that Calculus and the derivatives has gotten into my nerves at last:
I now realize that the very foundation of vector illustration is based on the tangent lines, the derivatives and various other worldly graphs. In short, they would hunt me even if I focus on art alone..
![](http://i2.photobucket.com/albums/y30/fairy-catcher/Blog%20things/tangentsquare.jpg)
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