The String Line and Augmented Reality

Replacing the bricklayer's line or the string line with the https://en.wikipedia.org/wiki/Laser_line_level

Way to go! 

https://en.wikipedia.org/wiki/Augmented_reality in action!

No more bumping the string line when you want to carry stuff over or worse it been hit before you do a concrete pour!

And your labourers are not going to be all equipped with HoloLens!