Surface envelop the mass and create mass with lines. Architects to-day are afraid of the geometrical constituents of surfaces but engineers can create a lot of forms with using relations of lines.In the present working, although surface extinguish the advantages of mass, in fact form of surfaces are made by lines.
Furthermore the primary and the purest states of geometry are spheres, cones and cylinders but these states scare the architects and they can not use these purity because they have contemporary aestheticts worries. However according to primary needs, engineers can made lines of mass and create limpid and moving plastic facts.