<b>Horacio Garcia Rossi</b> 
 (1929–2012)

<i>Horacio Garcia Rossi was an Argentine painter and kinetic artist. In 1960, he was one of the co-founders of the group of artists Groupe de Recherche d’Art Visuel (GRAV), alongside Julio Le Parc, François Morellet, Francisco Sobrino, Joël Stein and Yvaral.</I>

https://fr.wikipedia.org/wiki/Horacio_Garcia_Rossi

Composition in green
1978
Acrylic on canvas
26 x 26 cm
Private collection (sold on 30 October 2023)
https://www.arsvalue.com/en/lots/908892/horacio-garcia-rossi-1920-2012-composition-verte-1978-acrilico-su 

 Getulio Alviani
(1939 - 2018)
 

Getulio Alviani was an Italian painter based in Milan. He is considered to be an important International Optical - kinetic artist. 

https://en.wikipedia.org/wiki/Getulio_Alviani

Superficie a testura vibratile (Surface with vibratile texture)
1965/1968
installation with Aluminium
96 x 96 cm
Ministero degli Affari Esteri e della Cooperazione Internazionale. Collezione Farnesina, Rome, Italy

François Morellet
(1926–2016)

François Morellet was a French contemporary abstract painter, sculptor, and light artist. His early work prefigured minimal art and conceptual art and he played a prominent role in the development of geometrical abstract art and post-conceptual art

https://en.wikipedia.org/wiki/François_Morellet

Du jaune au violet (From Yellow to Violet)
1956
oil on canvas
110,3 x 215,8 cm
Centre Pompidou, Paris
https://www.centrepompidou.fr/en/ressources/oeuvre/c8E8b4R

 This is one of the rare paintings that François Morellet devoted to colour in the mid-1950s. The two contrasting series of concentric squares demonstrate the dual possibility of going from yellow ta violet according to the laws of colour: by warm tones (orange and red) or cold tones (green and blue). The shades are obtained through an optical blend of lines painted in the basic hues they are composed of. The artist ensured neutrality and precision through the entirely mechanical application of the lines using a paint roller.

Eduardo Mac Entyre
(1929–2014)

Eduardo Mac Entyre was an Argentine artist known for his geometric paintings.

https://en.wikipedia.org/wiki/Eduardo_Mac_Entyre

Pintura Generativa: Trama General por Circunferencias

1964
oil on canvas
77 × 169 cm
Art Museum of the Americas, Washington, United States

Detail

<i>Mac Entyre suggests movement and a concomitant sense of time through the intersection of a fragmentary series of concentric circles with two rectangular grids, each composed of precise horizontal lines. The divergence and convergence of the two patterns, drawn in magenta and blue against a vibrant red background, creates an optical dissonance and inconsistent transparency that produces a dizzying, moiré pattern. -Text by Mark Andrew White</i>

Diego Masi 
(b. 1965)

Diego Masi is an Uruguayan artist. He spent his childhood between Montevideo, Lima, Buenos Aires, and New York. He graduated from the National School of Fine Arts of Montevideo, where he trained at the Luis Ernesto Aroztegui Workshop between 1987 and 1993. 

In his work, Masi is equally interested in painting and sound art as he is in electromechanical and urban installations. However, he is better known for his monochromatic paintings, depicting them like whirlpools rhythmically contrasted by black and white. By integrating repetitive lines and shapes, and playing with shadow and light, Diego Masi's biomorphic creations oscillate between painting and sculpture, highlighting his exploration of movement and three-dimensionality.

https://www.lot-art.com/auction-lots/Diego-Masi-1965-Defensa/98401615-diego_masi_1965-19.10.25-catawiki

Ascendente geométrico (Geometric Ascendant)
2002
Acrylic on canvas
170 x 140 cm
Inter-American Development Bank, Washington, United States

Carlos Cruz-Diez
(1923 - 2019)
 

Carlos Cruz-Diez was a Venezuelan artist who played a central role in the development of Kinetic and Op art. His work focused on the perceptual and spacial experience of color, presenting it as an autonomous event rather than a descriptive tool.

https://en.wikipedia.org/wiki/Carlos_Cruz-Diez

Physichromie No. 965
1977
mixed media
150 x 100 cm
Art Museum of the Americas
Washington, United States
https://www.oas.org/artsoftheamericas/carlos-cruz-diez

Physichromie No. 965, and other works from that period, use the reflective nature of metal strips to produce colors in addition to those physically silkscreened onto the support of the work, resulting in what Cruz-Diez has called “a continuous evolutionary event involving chromatic atmospheres.” He used red, yellow, blue, white, and black on the support, but as the viewer alters position in relation to the work, the colors visible on the surface change and create an awareness of the concomitant passage of light and time. -Text by Mark Andrew White

 Bridget Riley
(b. 1931)

Bridget Louise Riley CH CBE  is an English painter known for her op art paintings. She lives and works in London, Cornwall and the Vaucluse in France.

https://en.wikipedia.org/wiki/Bridget_Riley

Arrest 2
1965
Acrylic on linen
195 cm x 190 cm 
The Nelson-Atkins Museum of Art, Kansas City, United States

Art critics of the 1960s dubbed Riley's optical painting style Op Art. By the time her work was exhibited at the Museum of Modern Art in New York in 1965, it already had been embraced by the fashion and design industry. Today her paintings are inspiring a new generation of abstractionists because of what they say about the magic of seeing.