Simple Whistle

function main( )
{
    return difference(
        cylinder( { r: 10, h: 50 } ),
        cylinder( { r: 8, h: 40 } ).translate( [ 0, 0, 2 ] ),
        cube( [ 20, 20, 8 ] ).rotateY( 60 ).translate( [ 5, -10, 30 ] ),
        cube( [ 2, 10, 10 ] ).translate( [ 4, -5, 40 ] )
    );
}