x²+y²+z²≤r²

rt4a

  1. rt4a, x²+y²+z²≤r², 2026, acrylic, charcoal pencil and pastel pencil on cotton canvas with gummed kraft tape, 46 × 46 × 2 cm

    x²+y²+z²≤r²

    2026
    Acrylic, charcoal pencil and pastel pencil on cotton canvas with gummed kraft tape
    46 × 46 × 2 cm
    RT4A-2606-0201
    Courtesy of the artist

    x²+y²+z²≤r² is the equation of a solid ball: every point whose distance from the centre is at most r. The other canvases of Chiaroscuro, the series I began in January 2026, take the catalogue number of their source; this one takes a definition. I gave the formula a body, a sphere and its cast shadow on acid yellow, on the only square canvas of the series.

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