..."A dangerous crossing, a dangerous wayfaring, a dangerous looking-back, a dangerous trembling and halting.
What is great in man is that he is a bridge and not a goal: what is lovable in man is that he is an OVER–GOING and a DOWN–GOING."...
sqrt(cos(x))*cos(200 x)+sqrt(abs(x))-.07)*(4-x*x)^0.01, sqrt(9-x^2),-sqrt(9-x^2) from -4.5 to 4.5