Notice the Hinge Pin of
Yoda's Hinge Machine is always positioned "vertical" or perpindicular to the associated plane of it's intended motion..
Notice a "vertical" pin to the horizontal plane of the ground or floor...
Thus what's called a
Horizontal Hinge...
Notice a "vertical" pin to the Inclined Plane...
Thus what is called An
Angled Hinge...
Notice a "vertical" pin to the Vertical Plane of the wall
Thus what is called a
Vertical Hinge...
Pins are always vertical to what ever plane they are associated to...the blade swings in a circle around the pin ....the motion of the blade represents the motion of it's plane ...the associated plane