It seems the result is a complex number. Fiddled around with it a bit until I got lucky and got the plane to disappear. http://vicapow.github.io/equation-plot-

It seems the result is a complex number. Fiddled around with it a bit until I got lucky and got the plane to disappear. http://vicapow.github.io/equation-plot-webgl/index.html#0.48-re((sqrt(0.15-((x-0.5)%5E2%2B(y-0.5)%5E2))*i*100%20%2B%20(sqrt(0.15-((x-0.5)%5E2%2B(y-0.5)%5E2))%20*%20(round(random())%20*%202%20-%201)))) http://vicapow.github.io/equation-plot-webgl/index.html#0.48...)