next might have a variable you can modify. I recommend Turbo speed for this. The vector field is: p=-y/(sqrt(x^2+y^2)+1) q=x/(sqrt(x^2+y^2)+1) based on an Applet from MIT for vector fields (TEAL, for electromagnetism) at http://web.mit.edu/8.02t/www/802TEAL3D/visualizations/vectorfields/licapplet/licapplet.htm (specifically, the "grass seeds" method of visualization)
