def draw_axes(axes, origin=(-1, -1, -1), length=(2, 2, 2)):
    """Draw wireframe axes lines, with given origin and length"""
    x, y, z = origin
    dx, dy, dz = length
    axes.plot([x, x + dx], [y, y], [z, z], color='black')
    axes.plot([x, x], [y, y + dy], [z, z], color='black')
    axes.plot([x, x], [y, y], [z, z + dz], color='black')
