At the entrance to a Chinese garden, there is usually a huge stone or wall to screen your view.

But the next step is to go beyond a software crutch, Ms Stone says, and to learn to change one's behaviour without the need for full-screen modes and internet-disabling utilities.

Three walls, part stone, part brick, and simulating a small, square tower, and folded like the leaves of a screen, surround it on all sides.