# Hyperbola-like object with x and y axes and asymptotes
line dashed from (-1,-1) to (1,1)
line dashed from (1,-1) to (-1,1)
line <-> from (-1,0) to (1,0)
line <-> from (0,-1) to (0,1)
spline <-> from (1,.9) down .9 left .9 then down .9 right .9;
spline <-> from (-1,.9) down .9 right .9 then down .9 left .9;