Convective boundary layers over land and water often display a variety of coherent structures that can be attributed to different causative mechanisms and a variety of physical interpretations. This paper will attempt to clarify these physical processes and the roles they play in the onset of convection, the preferred shape, circulation direction, aspect ratio, and the convective scaling that can occur. Discussion will give consideration to both field observations and classical theoretical and laboratory convection studies. Two-D or not Two-D has evolved into a contemporary discussion of convection that can be referred to as Rollology or Cellology