1. IN A MANNIKIN, IN COMBINATION: A TORSO SECTION IN THE FORM OF A HOLLOW SHELL INCLUDING A SHOULDER PORTION HAVING A CIRCULAR NECK SEAT DEFINING A NECK OPENING; AND INCLUDING A HEAD PORTION AND A GENERALLY FRUSTO-CONICAL NECK STEM OF A DIAMETER DECREASING IN A DOWNWARD DIRECTION, SAID STEM PROJECTING DOWNWARDLY THROUGH SAID OPENING AND HAVING A PORTION OF INTERMEDIATE DIAMETER FITTED TO AND SUPPORTED ON SAID SEAT AT A SUBSTANTIAL DISTANCE BELOW SAID HEAD, SAID STEM HAVING AN EXTERNAL SURFACE OF OVOID FORM IN AXIAL SECTION WITH AN CONVEX LONGITUDINAL CURVATURE SUCH AS TO PROVIDE FOR UNIVERSAL PIVOTING OF SAID HEAD SECTION TO SELECTED TILTED ATTITUDES WITH SAID HEAD AND THE EXPOSED PORTION OF SAID STEM DISPLACED HORIZONTALLY WITH RESPECT TO SAID NECK OPENING, SAID NECK STEM BEING SUPPORTED ON SAID SEAT BY SEATING ENGAGEMENT THEREWITH FREE OF ANY TYING CONNECTION TO SAID TORSO SHELL, AND BEING OF SUCH ELONGATION IN ITS FRUSTO CONICAL PORTION AS TO REQUIRE INCREASING ELEVATION OF SAID HEAD SECTION FOR INCREASING TILT THEREOF, WHEREBY TO PROVIDE STABILITY OF SUPPORT OF SAID HEAD SECTION IN A PLURALITY OF SAID TILTED ATTITUDES.