I. [v73-20] on the randomly selected intersections of lines with the sides of a 1 × 1 cm grid, lines are drawn at a distance of 1 cm with other side with at random selection of colour (6 colours); coloured pencil with graphite pencil on paper

II. [v73-21] lines are drawn at a distance of 1 cm with random selection of colour (6 colours), number of lines, position (horizontal/vertical) and beginning/end of zones of lines; coloured pencil with graphite pencil on paper

III. [v73-22] lines are drawn at a distance of 0.5 cm with random selection of colour (6 colours), number of lines, position (horizontal/vertical) and beginning/end of the zone of lines; coloured pencil with graphite pencil on paper

IV. [v73-70] on the intersections of 2 groups of diagonally drawn lines (3 to 9, number randomly selected), dots with at random selected size (5 sizes) are placed; black ink with graphite pencil on paper

V. [v73-71] on the intersections of randomly selected number of diagonally drawn lines (3 to 5, number randomly selected), dots are arranged with at random size (5 sizes); black ink with graphite pencil on paper

VI. [v73-72] on the intersections of randomly selected number of diagonally drawn lines (3 to 5, number randomly selected), dots are arranged with at random selected size (5 sizes) [program as v73-71]; black ink with graphite pencil on paper

VII. [v73-73] on the intersections of randomly selected number of diagonally drawn lines (3 to 5, number randomly selected), dots are arranged with at random selected size (5 sizes) [program as v73-72; black ink with graphite pencil on paper

VIII. [no work number] black ink with graphite pencil on paper

IX. [v73-74] on the intersections of diagonal lines, dots with at random selected size (size 1-5) are distributed; the first diagonal line connects 2 randomly selected points on 2 sides and other lines are placed at a parallel distance of 3 cm; black ink with graphite pencil on paper

X. blank

XI. [v73-75] on the intersections of a 2 × 2 cm grid, dots with at random selected size (1-5) and colour (red/black) are arranged; coloured ink with graphite pencil on paper

XII. [v73-76] on the intersections of a 2 × 2 cm grid, dots in 1 size and at random selected colour (red/black) are arranged; coloured ink with graphite pencil on paper

XIII. [v73-77] vertical lines are drawn at a distance of 5 mm with at random selection of colour (red/yellow); coloured ink with graphite pencil on paper

XIV. [v73-78] on the intersections of a 2 × 2 cm grid, dots in 1 size and at random selected colour (yellow/black) are arranged [program as v73-76]; coloured ink with graphite pencil on paper

XV. [v73-79] vertical lines are drawn at a distance of 5 mm with at random selection of colour (blue/yellow) [program as v73-77]; coloured ink with graphite pencil on paper

XVI. [v73-80] horizontal and vertical lines are drawn at a distance of 5 mm with at random selection of colour (blue/yellow) [program as v73-79]; coloured ink with graphite pencil on paper

XVII. [v73-81] horizontal and vertical lines are drawn at a distance of 5 mm with at random selection of colour (red/yellow) [program as v73-80]; coloured ink with graphite pencil on paper

XVIII. [v73-82] horizontal and vertical lines are drawn at a distance of 5 mm with at random selection of colour (red/yellow/blue) [program as v73-80]; coloured ink with graphite pencil on paper