// Shown's coding #14

size(300,300);
background(0);
smooth();

ellipseMode(CENTER);
rectMode(CENTER);

stroke(255);
noFill();
strokeWeight(1.5);
rect(125,100,100,100);

line(75,150,75,250);
line(175,150,175,225);

noStroke();
fill(200,0,0,50);//alpha
ellipse(210,190,50,50);