Above is one of the round "rooms" found by the Desert Team where the lines of "kites" intersect. In the background, you can also see one of the low lines that extends from this "room."
Below is a good image showing how low the lines are.
Also, it is not a gate. It is a door. You unlock this door with the key of imagination. Beyond it is another dimension - a dimension of sound, a dimension of sight, a dimension of mind. You're moving into a land of both shadow and substance, of things and ideas. You've just crossed over into... the Twilight Zone.