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float x = 0;
float y = 0;
float size = 15;
void setup() {
fullScreen();
background(0);
}
void draw() {
fill( random(255,255) , random(0,255) , random(0,0) );
ellipse(x,y,size,size);
x = x + size;
if ( x > width ) {
x = 0;
y = y + size;
}
}