This is a plot/heightmap of a function of two variables that I have discovered. It shows the region from [-10,-10] to [10,10] with grayscale values adjusted so that white/black matches the maximum/minimum value in the plotted region. The function formula is following: r = sin(1.2 * y + 2.5 * sin(x) + 2 * cos(2.25 * y) * sin(x)); log(2 * sqrt(abs(r)) - r).
<a href="//commons.wikimedia.org/wiki/User:Drummyfish" title="User:Drummyfish">Drummyfish</a>
<span class="int-own-work" lang="en">Own work</span>