The pioneering spherical shape of this emergency stop button, which was designed with a very low mounting depth, is as aesthetically surprising as it is expedient, since its function is clearly visible and instantly recognisable. In the case of an emergency, the machine is immediately stopped by pulling the spherical head and thus put in a safe state. The head has a pleasant feel, which has been realised by a complex eroding procedure which also increases the scratch resistance of the surface.