1. a tower, architectural setting, etc., for defending or adorning such an opening or for providing a monumental entrance to a street, park, etc.
2. A structure that can be swung, drawn, or lowered to block an entrance or a passageway.
But was is a gate, exactly? First, you have to lay a foundation; Everything begins with a foundation. A steel beam is mounted into the concrete to support the gates.
The rock shell is filled with concrete, further supporting the steel beam. Electricity runs up through the center, as well, so plan carefully!
Jack has made wrought iron gates, bending the rods and sautering the pieces together himself. The torch he was usually actually blew up while he was making his first (and only) full sized gate, pretty much burning all the skin off the back of his legs. But back to this gate.
So once you have the steel beam in, the gate is hung from the steel beam. The rock is just for decoration.
This gate, by the way, isn't the same one from above.