,
by dragging the top or bottom side of the control path horizontally,
when the mouse pointer changes to the
horizontal shear cursor
.
to create a fractional brick repeat with a smaller horizontal shift in which
every other row is rotated 180°.
and the Perpendicular mirrors & glide symmetry
let you create fractional brick repeats with additional mirror symmetries.
and Half-turn
symmetries, you will typically use both
horizontal and vertical blending
to create seamless brick patterns.