// Example 05-21 from "Getting Started with Processing" 
// by Reas & Fry. O'Reilly / Make 2010

int x = 215;
int y = 45;

void setup() {
  size(480, 480);
}

void draw() {
  if (keyPressed && (key == CODED)) { // If it's a coded key
    if (keyCode == LEFT) {            // If it's the left arrow
      x--;
    } 
    else if (keyCode == RIGHT) {      // If it's the right arrow
      x++;
    } else if (keyCode == UP) {
      y--;
    } else if (keyCode == DOWN) {
      y++;
    }
  }
  rect(x, y, 50, 50);
}