[EdZ]

Another visual that can help with the hinges is to imagine your elbows/upper arms are 'flat' on a sheet of glass (the plane) at address.

In horizontal hinging, think of your hands 'rolling' up the plane, down the plane. - clockwise, then counter clockwise - 90 degrees back, 180 through.

In angled hinging, think of your hands/under arms 'sliding' up the plane/down the plane. Staying verticle - 'slapping' motion - the paddle wheel.

In verticle hinging, think of your hands 'rolling under' up the plane, down the plane - counter clockwise, clockwise. A 'concave' feel.