1.   Most brick buildings have walls that are flat over large areas.

2.   This has walls thick with blood capillaries which absorb gaseous oxygen.

3.   The fort had massive walls.

4.   This apartment building has thin walls, and you can hear everything your neighbors say.

5.   Generally they have thinner walls and are unbuttressed, having pilaster strips and long-and-short work quoins.

6.   The lower storey has thick walls while the upper one has thinner walls set back to form a terrace all round at first floor level.

7.   As he passed the bank next door he noticed that it too had a side passage, but this one was decked out with tiles and had painted walls.

8.   Although many workplaces have fire walls to protect their computer networks from outside intrusion, some partly disabled the barriers to allow the use of Napster.

9.   And this one has no walls.

10.   Art galleries have had matte walls for years.