HGroup + nesting + HOscillator

HGroup rects;
HRect r1, r2;

void setup(){
    size(640,640);
    H.init(this).background(#202020);
    smooth();

    rects = H.add(new HGroup());
    rects.anchorAt(H.CENTER).loc(width/2,height/2);

    r1 = new HRect(100).rounding(10);
    rects.add(r1)
        .anchorAt(H.CENTER)
        .noStroke()
        .fill(#FF3300)
    ;

    r2 = new HRect(50).rounding(5);
    rects.add(r2)
        .anchorAt(H.CENTER)
        .noStroke()
        .fill(#0095a8)
    ;

    new HOscillator()
        .target(rects)
        .property(H.SCALE)
        .range(0.25, 2)
        .speed(0.5)
        .freq(5)
    ;
}

void draw(){
    H.drawStage();
}