Marina Apollonio
(b. 1940)

Marina Apollonio is an Italian painter and optical artist. She lives and works in Padua.

In 1963, Apollonio produced her first work, Metal Reliefs with Alternate Color Sequences. She shared with other Op-Artists the interest in a depersonalized art, as opposite to Abstract Expressionism. She used industrial material in her process, creating dynamic and fluctuating environments in the user's perception.

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

Circular Dinamic 6S blue + red
1966
oil on canvas
40 x 40 cm
Private collection. Sold Friday 18 December 2020, 03:00 PM • Rome 
https://www.finarte.it/asta/arte-moderna-e-contemporanea-roma-2020-12-18/marina-apollonio-dinamica-circolare-6s-blu-rosso-58289?lang=en

Kazys Varnelis
(1917 - 2010)

Kazys Varnelis was an abstract painter from Lithuania. He lived and worked in the United States of America for fifty years, between 1949 and 1998. His distinctive painting style demonstrated optical and three-dimensional illusions based on geometric abstractions and minimal forms. His style combined elements of constructivism, minimalism, and op art. His work is sometimes described as a modernist interpretation of Lithuanian folk art and is owned by Solomon R. Guggenheim Museum, the Art Institute of Chicago, Currier Museum of Art, and other museums.

https://en.wikipedia.org/wiki/Kazys_Varnelis_(artist)

Synchrony
1969
Acrylic on Canvas
198,1cm x 149,2 cm
Lithuanian Art Centre TARTLE, Vilnius, Lithuania

Julian Stanczak
(1928 - 2017 )

Julian Stanczak was a Polish-born American painter and printmaker who is considered a central figure of the Op art movement in the U.S. during the 1960s and 1970s. Described as an artist whose work "evinced a tremendous geometric inventiveness", Stanczak is primarily known for his large-scale polychromatic abstract compositions made using acrylic paint on canvas in which he explored the perceptual dimensions of color.

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

And Then There Were Three
1971
acrylic on canvas
121.9 x 365.8cm
Toledo Museum of Art, Toledo, Ohio, USA
https://emuseum.toledomuseum.org/objects/58734/and-then-there-were-three

 Jesús Rafael Soto
(1923–2005)

Jesús Rafael Soto was a Venezuelan kinetic and op artist, a sculptor and a painter.

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

Sin título
Serigraphy
60 x 60 cm
Inter-American Development Bank, Washington, United States

<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.