Here you can freely explore graphs of complex functions.
Variables accessible in the freely editable formula are $a,b,c,d,e, A,
B, C, D$
Where $a,b,c,d$ depend on the position of the colored points
$A,B,C,D$. The dependence is
\[
\definecolor{red}{RGB}{255,0,0}
\definecolor{green}{RGB}{0,255,0}
\definecolor{blue}{RGB}{0,0,255}
\definecolor{yellow}{RGB}{200,200,0}
\color{red} a=z-A,
\color{green} b=z-B,
\color{blue} c=z-C,
\color{yellow} d=z-D.
\]
Here $z$ is the location in the image. Variable $e$ is a real scalar that can be adjusted
between $-1$ and $+1$ and time is the time in seconds.