// first, circles/pyramids 
//are contrasted with line

line 0 20 100 20
line 0 80 100 80
repeat a 48 52
{
   line 0 a 100 a
}

load dbngraphics.dbn

repeat t 0 17
{
   Circle t 20 t 100
}
repeat t 0 17
{
   Circle t 80 t 100
}
repeat t 0 30
{
   Circle t 50 t 100
}

//and now the same forms but
//set against a different 
//background to have
//a different effect on the 
//contrast: more lines,
//this time vertical, contrasting 
//the circles as well as changing 
//the color of the background

repeat b 0 100
{
   line (b*3) 0 (b*6) 100
}