English: Stephen Jay Gould's argument against evolution tending to complexity. Life emerges next to the "left wall" of minimal complexity. This prokaryote or bacterial style of life has remained most common and most successful from the Precambrian to the Present. A few creatures occasionally move to the right, thus extending the right tail in the distribution of complexity. Many more move to the left,where they are absorbed within space already occupied. The bacterial mode has not changed position, but just grown higher (more abundant) through time.