What is a brick line?
A brick line (also known as a "mason's line", "builder's line" or "brick twine") is essentially a long, often brightly coloured, length of string that does not easily stretch.
A brick line is a commonly used bricklayer's aid. It is employed as a reference line and guide when building plumb (vertical) and level (horizontal) walls.
A brief history of the brick line
The brick line is one of the earliest tools used by man. The ancient Egyptians were known to use them in the construction of the Pyramids.
Whereas the Egyptians would have used simple cotton twine, with 20th Century developments most brick lines are now made from man-made fibres.