Please upgrade your browser to something new like Google Chrome. //Made with ProcessingLyon Tumblrify: //http://p5lyon.tumblr.com/ProcessingJSTumblr //English Version: //http://p5lyon.tumblr.com/ProcessingJSTumblrEn int number = 1; void setup() { size(400,400); background(255,252,0) noCursor() rectMode(CENTER); } void mouseDragged() { noStroke(); fill(250,number,number,20) rect(mouseX,mouseY,number,number); number = number + 1 if (number > 255){ number = 1; } }