[color=#0000ff][i][color=#0000ff][i][color=#999999]This activity belongs to the GeoGebra book [url=https://www.geogebra.org/m/saakgfvd]Voronoi Paintings[/url].[/color][/i][/color][/i][/color][br][br]Indeed, we aim to maximize the contrast between these two spaces, positive and negative, so we will consider positive space as consisting of focal areas that are gap-free and isolated.[br][br]If a focal area has a "gap", meaning it includes an internal color spot that we would interpret as negative space, we will treat that gap as an integral part of the positive space.[br][br]For example, in Figure 7 we see Van Gogh's painting [i]Sunflowers[/i]. To its right, in black, is its positive space, the silhouette of the vase with flowers. Notice how the gaps, the spaces between flowers, have been removed to create a gap-free form.[br][br][center][url=https://www.geogebra.es/paintings/figura%207a%20color.jpg][img]https://www.geogebra.es/paintings/peq/figura%207a%20color.jpg[/img][/url] [url=https://www.geogebra.es/paintings/figura%207b.png][img]https://www.geogebra.es/paintings/peq/figura%207b.png[/img][br][/url]Figure 7: [i]Gap-free silhouette of a focal area[/i][i][/i][/center][br]By isolated, we mean without a common border. If two focal areas share a border (or even give the illusion of "overlapping"), we will consider them as part of a single focal area that integrates both.[br][br]In the upper part of Figure 8, an abstract painting (see Malevich's painting later), two rectangular shapes seem to overlap: a wide orange rectangle appears to partially cover a thin red rectangle. Notice how their silhouettes merge into one.[br][br][center][url=https://www.geogebra.es/paintings/figura%208a%20color.jpg][img]https://www.geogebra.es/paintings/peq/figura%208a%20color.jpg[/img][/url] [url=https://www.geogebra.es/paintings/figura%208b.png][img]https://www.geogebra.es/paintings/peq/figura%208b.png[/img][/url][br]Figure 8: [i]Two focal areas merging into a single silhouette[/i][i][/i][/center]

[br][color=#999999][color=#999999][color=#0000ff][color=#0000ff][color=#999999][color=#999999]Authors of the activity: [/color][/color][/color][color=#0000ff][color=#999999][color=#999999][url=https://www.geogebra.org/u/rafael]Rafael Losada[/url] & [color=#999999][color=#999999][color=#0000ff][color=#0000ff][color=#999999][color=#999999][url=https://www.geogebra.org/u/tomas+jesus]Tomás Recio[/url][/color][/color][/color][/color][/color][/color].[/color][/color][/color][/color][/color][/color]