A clear plastic tube with water in it is one way to calculate where level is when you don't have a sting-line level or a fancy laser level. Waller and landscaper Patrick Callon is checking how his end of the amphitheatre bench measures up to the height established by co-worker Mike Melo on his section.
Mike can see that the water line is exactly where it should be.
Someone came up with a new name for this tube level device which Toronto waller Menno Braam brought to the Rocktoberfest pre-build at Hart House farm last Monday. I think they called it a 'phuzy'.
Menno, on the other hand, is building another part of the amphitheatre that has to be oriented 'on the bias'. It's a pity there is no kind of 'phuzy' to measure what he's trying to do.