One of the most vexing problems of computer graphics remains one of interactivity. A 10-cent pencil still has a better interface than most computers I've used: Press harder and the line gets darker. Angle the pencil and the line gets wider. Computers still have a long way to go in this regard. One of the biggest problems for artists is one of visual disconnect, meaning that you draw on a tablet or with the mouse, but have to look at a CRT screen in a completely different location. This messes with the visual hand/eye coordination that we've spent most of our lives developing. Many digital artists have become used to the disconnect, but only out of sheer necessity.
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