Wall Drawing #327 by Sol LeWitt (1928-2007).

Wall Drawing #327

1. On a black wall
2. ... a white trapezoid ...
3. ... within which are white vertical parallel lines ...
4. ... and a white square ...
5. ... within which are white horizontal parallel lines.
6. The vertical lines within the trapezoid do not enter the square ...
7. ... and the horizontal lines within the square do not enter the trapezoid.

Example:

• http://risdmuseum.org/art_design/objects/11093_wall_drawing_327?context=125&type=exhibitions

Wall Drawing #328 by Sol LeWitt (1928-2007).

Wall Drawing #328

On a black wall, a white circle within which are white vertical parallel lines, and a white parallelogram within which are white horizontal parallel lines. The vertical lines within the circle do not enter the parallelogram, and the horizontal lines within the parallelogram do not enter the circle.

Example:

• http://risdmuseum.org/art_design/objects/11094_wall_drawing_328?context=125&type=exhibitions