The type of art technique that this artist has used is what is known as abstract.
The reason why this is an abstract art is the fact that it does not show any form of pictorial reality.
Instead what is done here is the use of colors to create an effect. Abstract art does not communicate any form of reality.
It uses paintings like we have here to compose an artwork. It could also be created using shapes and lines.
Read more on abstract art here:
https://brainly.com/question/23107559
