Hello,
“Schlemiel has a job painting the dotted lines down the middle of a road. Each day, Schlemiel paints less than he painted the day before. When he is asked why, Schlemiel complains that it is because each day he gets farther away from the paint can…”
A usefully explanation of a common problem 
http://en.wikipedia.org/wiki/Schlemiel_the_Painter%27s_algorithm
AC.