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var speed = 10;
var x;
var y;
var diameter = 20;
function setup() {
createCanvas(400, 400);
x=width/2;
y=height/2
background(200);
}
function draw() {
// background(220);
x+= random(-speed,speed);
y+= random(-speed,speed);
ellipse(x,y,diameter,diameter)
if(
(x<0) || (x>width) || (y<0) || (y>height)
){
x=width/2;
y=height/2
}
}