This neat GIMP plugin lets you render a pixelmap (image layer) according to a variety of formulae.
In other words, you can draw areas with complicated maths, for when those days of hand-shading areas is too hard or not accurate enough.
Scientific research consists in seeing
what everyone else has seen,
what no one else has thought
The reasonable man adapts himself to the world;
the unreasonable one persists in trying
to adapt the world to himself.
Therefore all progress depends
on the unreasonable man.
It is nothing short of a miracle
that modern methods of instruction
have not yet entirely strangled the holy curiosity of inquiry.
For this delicate little plant, aside from stimulation,
stands mainly in need of freedom.
Scintillate, scintillate | Globule vivific
Fain would I fathom | Thy nature specific
Loftily perched | In the ether capacious
Strongly resembling | A gem carbonaceous.