.7/sqrt(2)
By Chris Moen at May 26 2021
1.2+(sqrt(1-(sqrt(x^2+y^2))^2) + 1 - x^2-y^2) * (sin (10000 * (x*3+y/5+7))+1/4) from -1.6 to 1.6
By MinuteMaker42 at Jul 23 2021