one of his works. By presenting a painting without even a few words to name and explain it, he felt he was "letting a thing come, rather than creating it." In his abstract pictures, Richter builds up cumulative layers of non-representational painting, beginning with brushing big swaths of primary color onto canvas. The paintings evolve in stages, based on his responses to the picture's progress: the incidental details and patterns that emerge. Throughout his process, Richter uses the same techniques he uses in his representational paintings, blurring and scraping to veil and expose prior layers. From the mid-1980s, Richter began to use a homemade squeegee to rub and scrape the paint that he had applied in large bands across his canvases. In an interview with Benjamin H.D. Buchloch in 1986, Richter was asked about his "Monochrome Grey Pictures and Abstract Pictures" and their connection with the artists Yves Klein and Ellsworth Kelly. The following are Richter's answers: The Grey Pictures were done at a time when there were monochrome paintings everywhere. I painted them nonetheless. ... Not Kelly, but Bob Ryman, Brice Marden, Alan Charlton, Yves Klein and many others. In the 1990s the artist began to run his squeegee up and down the canvas in an ordered fashion to produce vertical columns that take on the look of a wall of planks. Richter's abstract work and its illusion of space developed out of his incidental process: an accumulation of spontaneous, reactive gestures of adding, moving, and subtracting paint. Despite unnatural palettes, spaceless sheets of color, and obvious trails of the artist's tools, the abstract pictures often act like windows through which we see the landscape outside. As in his representational paintings, there is an equalization of illusion and paint. In those paintings, he reduces worldly images to mere incidents of Art. Similarly, in his abstract pictures, Richter exalts spontaneous, intuitive mark-making to a level of spatial logic and believability. Firenze continues a cycle of 99 works conceived in the autumn of 1999 and executed in the same year and thereafter. The series of overpainted photographs, or übermalte Fotographien, consists of small paintings bearing images of the city of Florence, created by the artist as a tribute to the music of Steve Reich and the work of Contempoartensemble, a Florence-based group of musicians. After 2000, Richter made a number of works that dealt with scientific phenomena, in particular, with aspects