This is a plot/heightmap of a function of two variables that I have discovered. It shows the region from [-4,-4] to [4,4] with grayscale values adjusted so that white/black matches the maximum/minimum value in the plotted region. The function formula is following: sqrt(triangle_wave(x + sqrt(triangle_wave(x + 0.4 * sin(y*3))))).
<a href="//commons.wikimedia.org/wiki/User:Drummyfish" title="User:Drummyfish">Drummyfish</a>
<span class="int-own-work" lang="en">Own work</span>