As he did so his eye casually fell on the handsome girl by the doorpost, who was looking at him.
Leaning against the doorpost, he at first chuckled and then roared.
The marks are reminiscent, too, of those used by carpenters to aid them in their work, which might explain their appearance on doorposts if not on trees.
If you break those things you can put up the whole of the house except, for example, the doorpost.
I should never be happy unless seat belts were able to be unhooked at the doorpost of a car.