group();
group();
group();
group();
group();
group();
group();
group();
group();
group();
cube(size = [1, 1, 1], center = false);
sphere($fn = 0, $fa = 12, $fs = 2, r = inf);
cylinder($fn = 0, $fa = 12, $fs = 2, h = inf, r1 = -inf, r2 = -inf, center = false);
group();
group();
group();

