locked position shown in fig2 the orientation of the hinge 1 with respect to the solid articles 30 restricts the movement of the pivoting elements 3 with respect to one another in the locked position the axis of rotation of the pivoting elements 3 is perpendicular to the only available axis of rotation of the solid articles 30 as a result the solid articles 30 are fixed in position in relation to one another the collar 10 is attached to or set into the articles 30 being hinged each collar piece 11 is inset on one side of the hinge joint 15 extending between the articles 30 because the collar 10 is set into the two articles 30 the hinge 1 can be flush with the articles 30 in use in order to unlock the hinge 1 a user rotates the hinge 1 with respect to the articles 30 this rotates the connectors 5 and connecting shafts 6 in relation to the articles 30 the collar 11 on the other hand is fixed with respect to the articles 30 the hinge element 2 can be rotated with respect to the articles 30 the hinge can be rotated 90 degrees a ridge 15 associated with the connectors 5 and an inset portion 16 associated with the collar interact to stop the hinge 1 from rotating an angle greater than 90 degrees in other forms the hinge can be rotated through up to 360 degrees by incorporating a ridge which interacts to stop the hinge from rotating more than 180 degrees 270 degrees or any angle when no ridge is incorporated the hinge can be rotated 360 degrees when the hinge can be rotated through 360 degrees the direction of freedom of movement can be rotated through 360.