To alter the default position of the first basin, the following prompt is presented:
start position, % offset from screen centre:
x (default 80): y (default 50): (values shown are examples)
Enter the new polar co-ordinates, first x, then y. Remember that the screen centre is at 0,0 and the edges of the screen are as follows, left x= -100, right x= +100, top y= +100, bottom y= -100. A position outside the screen limits is legal.