Rotate horzy and verty etched concrete around its vertical axis
when it's placed. This only affects the direction of the stripes
on the top and bottom of the blocks. For example, a cross-beam
made of horzy concrete can now have the stripes on the top and
bottom of the beam in the same direction as the stripes on the
sides, or not, as desired, where before the top and bottom stripes
always ran east-west.
152063a034