These images are generated by plotting a (usually large) number of discreet dots. No lines are drawn between dots.
Some of the images are created from mathematical equations, and can take a while to complete.
If a mapping function is used then they are called 'Iterative Function Systems' (IFS).
In XLogo, the dot command plots a single pixel in the pen color at the specified XY co-ordinates. The turtle does not move to the new position to draw the dot.
See also: Dots
Ginger Bread Man