This is a plot/heightmap of a function of two variables that I have discovered. It shows the region from [-8,-8] to [8,8] with grayscale values adjusted so that white/black matches the maximum/minimum value in the plotted region. The function formula is following: r = sqrt(triangle_wave(0.9 * x + sqrt(triangle_wave(sin(x + 0.2 * triangle_wave(2 * y) + 0.6 * sin(0.5 * y)))))).
<a href="//commons.wikimedia.org/wiki/User:Drummyfish" title="User:Drummyfish">Drummyfish</a>
<span class="int-own-work" lang="en">Own work</span>