size(400, 400);
strokeWeight(1);
strokeCap(PROJECT);
line(40, 360, 300, 360);
line(40, 360, 40, 20);
strokeCap(ROUND);

int barwidth = 20;
int gap = 10;

for (int x = 1; x < 9; x = x+1) {
strokeWeight(9-x);
fill(255-25*x,0,25*x);
rect((barwidth+gap)*x+2*gap,40*x,barwidth,360-40*x);
text(str(x), 30*x+barwidth+5, 380);
}

strokeCap(SQUARE);

strokeWeight(1);
fill(0);
text("Decreasing Bars", 130, 30);
text("freq", 1, 180);
text("number", 160, 390);

for (int x = 1; x < 10; x = x+1) {
line(40, 400-40*x, 30, 400-40*x);
text(str(9-x), 20, 40*x);
}

save("activity4.png");