The Corner Stone

The corner stone is the ground zero where they base all the measurements of a building from. It's kind of like the x y axis, if you're a mathematician, that zero point where the x and y intersect. At least in the northern hemisphere, that south east corner stone is where they put that first stone because it's the place of most light. The new testament authors really keyed in on what bryce is talking about with verse 22 when he says 'the stone was rejected'