1972.07
Yellow Circles, Red Grids, Black Arcs from Four Sides, Blue Arcs from Three Corners
1972.08
Arcs, Circles & Grids
1973.01
Straight, Not-Straight and Broken Lines in All Horizontal Combinations (Three Kinds of Lines & All Their Combinations)
1973.02
Circles
1973.03
Grids, Using Straight, Not-Straight, and Broken Lines in All Vertical & Horizontal Combinations
1973.04
Grids, Using Straight, Not-Straight, and Broken Lines in All Vertical & Horizontal Combinations
1973.05
Straight Lines in Four Directions & All Their Possible Combinations
1973.06
Composite of Straight, Not-Straight & Broken Lines
1974.01
The location of six geometric figures (circle, square, triangle, rectangle, parallelogram and trapezoid)
1975.01
Die Plazierung eines Vierecks (The Location of a Quadrangle)
1975.02
Color Grids
1975.03
Color Grids
1975.04
Lines to Specific Points
1975.05
Lines to Specific Points
1975.06
The Location of Lines
1975.07
All Combinations of Arcs from Corners and Sides; Straight, Not-Straight and Broken Lines
1975.08
Arcs and Lines
1975.09
Lines and Color
1975.10
The Location of Six Geometric Figures: The location of a circle, parallellagram, square, trapezoid, triangle, and rectangle
1975.11
The Location of Fourteen Points
1975.12
Stone Walls
1976.01
All One, Two, Three & Four Part Combinations of Lines in Four Directions
1976.02
All One, Two, Three & Four Part Combinations of Lines in Four Directions
1976.03
All Combinations of Red, Yellow & Blue Straight, Not-Straight & Broken Lines on Red, Yellow and Blue
1976.04
The Location of Lines in Color On Color
