Some decades ago it was more common to communicate the details of engineering components via orthographic projections. These often show two dimensional views of components to be made, guiding technicians on the manufacturing procedure to engage to achieve intricate structural features. In this age, faster computers has allowed the visualization of the components in a three dimensional manner. This has minimized erroneous orthographic interpretation thereby enhancing the quality of the part being made. Yet we should not forget aspects of the evolution of computer aided design. The board on pin interest shows some interesting examples of orthographic, isometric and solid modelling of mechanical parts. Please see below the link to the board.