I. [v69-21] the surface is divided in 3 horizontal areas (8 cm high); within these areas 50 dots in 4 sizes are distributed at random, in the upper area only dots of the smallest and the second to the smallest size ('4' and '3'), in the second dots with size '3' and '2', in the third '2' and '1'; black ink with graphite pencil on paper

II. [v69-22] the surface is divided in 6 horizontal areas (4 cm high); within these areas 50 dots in 5 sizes are distributed at random, in the upper area only dots of the largest and the second to the largest size ('1' and '2'), in the second dots with size '2' and '3', in the third '3' and '4', etc.; black ink with graphite pencil on paper

III. [v69-26] the surface divided in 16 squares; inside each square dots in 1 out of 5 sizes are distributed at random; black ink with graphite pencil on paper

IV. [v69-27] on the intersections of a 2 × 2 cm grid dots are arranged with at random selection of size (5 sizes); black ink with graphite pencil on paper

V. [v69-28] on the intersections of a 4 × 4 cm grid 25 dots are arranged with at random selection of size (5 sizes) [program as v69-27]; black ink with graphite pencil on paper

VI. [v69-29] on the intersections of a 2 × 2 cm grid dots are arranged with at random selection of size (5 sizes); on the upper 4 lines size '1' has 3 times; more chance being selected; id. next 4 lines and size '3', the bottom 4 lines and dot size '5'; black ink with graphite pencil on paper

VII. [v69-30] on the intersections of a 2 × 2 cm grid dots of the same size (randomly selected from 5 sizes) are arranged in groups of 3 × 3 intersections; black ink with graphite pencil on paper

VIII. [v69-31] from the intersections of a 2 × 2 cm grid 50 intersections were selected and dots of randomly selected size placed; on the other intersections dots of size '3' are placed; black ink with graphite pencil on paper

IX. [v69-62] lines in a 5 × 5 mm grid pattern with at random selection of colour (red and black); red and black ink with graphite pencil on paper

X. [v69-63] lines in a15 × 1 cm grid pattern with at random selection of colour (red and black); red and black ink with graphite pencil on paper

XI. [v69-64] horizontal lines (distance 1 cm) with at random selection of colour (black and red); black and red ink with graphite pencil on paper

XII. [v71-06] on the intersections of a 2 × 2 cm grid, dots are arranged with at random selection of size (4 sizes) and colour (8 colours); coloured ink with graphite pencil on paper

XIII. [v71-09] on the intersections of a 3 × 3 cm grid, dots are arranged with at random selection of place and size (in 5 sizes) but omitted on half of the intersections; black ink with graphite pencil on paper

XIV. [v71-10] on the intersections of a 3 × 3 cm grid, dots are arranged with at random selection of place and size (in 5 sizes) but omitted on half of the intersections [program as v71-09]; black ink with graphite pencil on paper

XV. [v71-14] on the intersections of a 2 × 2 cm grid dots (in 5 sizes) are arranged with at random selection of size; in 5 columns of two elements width dots are divided with different random procedures for each column [partly empty intersections]; black ink and graphite pencil on paper

XVI. [v71-15] 200 randomly selected points on the sides are connected by lines; graphite pencil on paper

XVII. [v71-18] dots with randomly selected size (5 sizes) arranged on the intersections of a 2 × 2 cm grid with diminishing density from left to right; black ink with graphite pencil on paper

XVIII. [v71-36] inside a randomly selected number of circles (1-10) and randomly selected radius of the circles (2-10 cm) dots of one size are placed (also randomly selected from 5 sizes); outside the circles dots are randomly selected; in black ink with graphite pencil on paper

XIX. [v71-37] inside a randomly selected number of circles (3-10) and randomly selected radius (2-10 cm) dots of one size are placed (also randomly selected from 5 sizes); within the overlapping sections dots are selected from two sizes; no dots outside the circles; in black ink with graphite pencil on paper