Hockney is known for his shining water in the swimming pool and works depicting two people. In 2017, he held the largest retrospective exhibition ever at the Metropolitan Museum of Art in the United States, and the momentum has not diminished. At the 2018 auction, "Artist Portrait" was sold for about 10.2 billion yen, and Hockney set a new record high as an existing artist. He has become an increasingly popular presence. This work "LITHOGRAPH OF WATER MADE OF LINES" is a rare lithograph work limited to 39 copies. Created by Tyler Graphics, well known for collaborating with prominent American artists, it uses original handmade paper for a fine lithograph finish and a "blind stamp" to prove it. On the back side, "DH78-474 A" and David Hockney's initials and product number are written with a pencil under the embossed mark of the same logo as the "blind stamp". In addition, it expresses an impressive world view with a refreshing and deep blue colour using two types of cyan blue. Hockney's representative works are the series of pools created from the 1960s to the 1970s. With gorgeous colours that make you feel the bright sunlight of the west coast of the United States, they depict familiar people such as indoor scenery, friends and relatives. The pop and flat works, such as portraits, shocked many people. In addition to oil paintings, he is also involved in many performing arts such as photo collages with crayon drawings and dozens of snapshots, and the Skala Theater and the Metropolitan Opera. Born in Bradford, England in 1937, Hockney studied at the Bradford College of Art in 1953-57 and exhibited at the Young Contemporary Artists Exhibition while still a student. In 1959, he entered the Royal College of Art. After graduating from college, Hockney travelled to California, USA and stayed there for several years from 1964. He was fascinated by the hedonistic and freedom-emphasizing swimming pools that characterize life in Southern California, and was inspired by it to begin producing a series of swimming pool paintings. At the time, he was one of the first to use the newly popular acrylic paints to paint the swimming pool in a vibrant, realistic and bright style. In 1967, he won the John Moores Painting Prize at the "John Moores Liverpool" exhibition at the Walker Art Gallery in Liverpool. In 1988, he created A Bigger Grand Canyon in the National Gallery of Australia. He composes one huge picture with 60 pictures. In 2001, he published Secret Knowledge: Rediscovering the Lost Techniques of the Old Masters. He argued that the masters of Western painting used optical devices such as concave mirrors, camera obscura, and camera lucida to paint. In 2017, David Hockney exhibition was held at Tate Britain. His 60-year career, which has constantly greedily adopted new technologies such as publishing paintings on the iPad and changed styles one after another, continues to attract attention for his age-insensitive activity.