Different types of formal expression can be found in the modern architecture of the 21st century - in publications, internet resources and in the generalizations of critics. In the context of the synthesis of arts the styles of sculptural architecture and surface architecture are noteworthy. Characteristics of this synthesis are also noticeable in kinetic architecture where the styles of surface kinetic architecture and sculptural kinetic architecture are distinguished. The genesis of images of buildings constructed in these styles is the result of the synthesis of arts; it reflects the development of historical styles as well as the ways of formal expression and their influences in the end of the 20th century and in the 21st century. This paper provides an analysis of constructed objects and proposals put forth in architectural competitions in Latvia’s 21st century modern architecture.