group() {
	difference() {
		sphere($fn = 0, $fa = 12, $fs = 2, r = 10);
		%cylinder($fn = 0, $fa = 12, $fs = 2, h = 30, r1 = 6, r2 = 6, center = true);
	}
	%group() {
		cube(size = [25, 6, 3], center = true);
	}
	%multmatrix([[1, 0, 0, 0], [0, 1, 0, -9], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		difference() {
			color([0, 0.501961, 0, 1]) {
				cube(size = [10, 4, 10], center = true);
			}
			color([1, 0, 0, 1]) {
				multmatrix([[1, 0, 0, 0], [0, 1, 0, -2], [0, 0, 1, 0], [0, 0, 0, 1]]) {
					sphere($fn = 0, $fa = 12, $fs = 2, r = 3);
				}
			}
		}
	}
	multmatrix([[1, 0, 0, 25], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
		minkowski(convexity = 0) {
			%cube(size = [10, 10, 10], center = true);
			cube(size = [5, 5, 5], center = true);
		}
	}
}