Written in stone

Difficult not to obey, when the rules are presented like this.

1 .No running joints.

2 .Use proper batter.

3 .You shall not trace.

4 .You shall not use mortar.

5 .Build along courses.

6 .Do not cheat on the hearting.

7 .Do not rush.

8 .Do not drop stones on the wall.

9 .Use the shapes you have.

10.Stand back and look.

Thanks to John Shaw-Rimmington for the photo.