surface is tipped to all principal planes of projection. Because it is not perpendicular to any projection plane, it cannot appear on edge in any standard view. This surface always appears as a foreshortened surface in all three standard views.
Surfaces or lines situated at an angle in relation to all the main projection planes are oblique. An oblique surface never appears in any of the main perspectives as a line or true size area. It's Tipped to all main projection planes. doesn't quite appear on the edge of every standard view. doesn't quite show up in any view in true size.it has always been foreshortened.
