Jai Kwan Kim
(b. 1947)
Kim Jae-gwan (金 在) is a painter of the Republic of Korea who has pioneered the space nature nature through geometric abstract paintings based on the spirit of geometry .

https://en.namu.wiki/w/%EA%B9%80%EC%9E%AC%EA%B4%80(%EB%AF%B8%EC%88%A0%EA%B0%80)

Relationship-Fiction 94 E∙F
1994
Shaped canvas, rice paper, acrylic
185 x 110 cm 
Korean Art Museum Association, South Korea

 Enrique Careaga
(1944 - 2014)

Enrique Careaga, a Paraguayan painter born in Asunción in 1944, is an essential figure in the contemporary art world of Latin America. 
Sphere Spatio-Temporelle BS 7523 belongs to a series of two-dimensional optical geometric works created in Paris starting in 1973. In this piece, Enrique Careaga interlaces the relationship between light and movement with that of time and space through the juxtaposition of geometric shapes—mainly spheres, lines, squares, or two-dimensional structures—on a completely black surface. 

https://mcnbiografias.com/app-bio/do/careaga-enrique

Sphere spatio-temporelle BS 7523
1975
acrylic on canvas
120 x 120 cm
Art Museum of the Americas, Washington, United States
https://www.oas.org/artsoftheamericas/enrique-careaga

Anthony Poon
(1945 - 2006)
 

Anthony Poon Kin Soon was one of the pioneer abstract artists in Singapore best known for his paintings in the Wave Series which he began working on in 1976. 

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

Squa-Forma
1975
Acrylic on canvas
82.9 x 182.9 cm
National Gallery Singapore

 Stan Slutsky
(b. 1941)

Stanford Slutsky was born in Pittsburgh, United States. Slutsky has exhibited in numerous venues and participated in many national and international competitions including Boca Raton Museum of Art 54th annual, All Florida Juried Competition and Exhibition, and in 2016 his sculpture “Assorted Candy” won at The Armory in West Palm Beach, and has been exhibited at the Sundook Fine Art Galleries in Delray Beach, FL. Some of his solo exhibitions: Coral Springs Museum of Art, The Ft Lauderdale Art Institute, Nathan D. Rosen Museum, Ft Lauderdale Museum of Art.

https://www.artsy.net/artwork/stan-slutsky-hexagon-hexagon-shaped

HEXAGON (HEXAGON SHAPED)
1994
Acrylic on canvas
88.9 × 101.6 cm
Private collection

 Tadasky (Tadasuke Kuwayama)
(b. 1935)

Tadasky (Tadasuke Kuwayama) grew up in Nagoya, Japan, where his father was a well known maker of Shinto shrines. He has lived and worked in New York City and upstate New York since 1961.
His work has been identified with so-called “Optical Art” since the Museum of Modern Art launched the much-noticed “Responsive Eye” exhibition in the 1960s. His main connection with the other artists of that “movement” is an abiding admiration for the Bauhaus group. He also became part of Yoshihara Jiro’s Gutai Pinacotheca group in Osaka, Japan in the early 1960s.

https://tadasuke.kuwayama.com/

B-171 
1964
Synthetic polymer paint on canvas 
38 × 38 cm
MoMA
https://www.moma.org/collection/works/78396?artist_id=5776&page=1&sov_referrer=artist

 Richard Anuszkiewicz 
(1930 - 2020)
 

Richard Joseph Anuszkiewicz was an American painter, printmaker, and sculptor. The son of Polish immigrants, he developed a geometric style. He was one of the leading figures in the Op Art movement during the late 1960s and throughout the 1970s.


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

The Cardinal Sanctuary
1963
Liquitex on hardboard 
121.6 × 121.9 cm.
The National Gallery, Washington DC.
https://www.nga.gov/artworks/176356-cardinal-sanctuary

Michael Kidner
1917–2009)
 

Michael James Kidner RA  was a British op artist. Active from mid-1960s, Kidner was an early exponent of the genre. Through his interest in mathematics, he was part of the Constructivism movement and chaos and wave theories influence his work. 

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

Yellow, Blue and Violet
1963
Oil on canvas
152 × 167 cm
Walker Art Gallery, Liverpool, Liverpool, United Kingdom