fullscreen
size(400, 400);
background(255);
stroke(0);
float space = 20;
for(
float yPos = 50;
yPos <= height - 50;
yPos = yPos + space
){
line(50, yPos, width/2, yPos);
yPos = yPos + space;
}
for(
float yPos = 50 + space;
yPos <= height - (50 - space);
yPos = yPos + space
){
line(width/2, yPos, width - 50, yPos);
yPos = yPos + space;
}