// increasing jump towards ultimate // height of brightness with cooperative // jumpy lines paper 100 paper 100 set shade 100 pen 0 repeat jump 1 15 { set shade (shade - jump) pen jump line (10 + jump) 50 (10 + jump) shade line 50 (10 + jump) shade (10 + jump) // paper shade x3 to slow down paper shade paper shade paper shade }