What type of projection allows for the portrayal of an object at an angle that is not perpendicular to its principal planes?

Oblique projection is a technique used in graphical representation that allows the depiction of objects from an angle that is not perpendicular to its principal planes. In this approach, the object is presented with one or more of its axes tilted relative to the viewer, which creates a sense of depth and dimension without distorting the scale of the object's features along those axes. This allows for a more informative view of the object, revealing multiple sides simultaneously.

This method contrasts with orthographic projection, where the object is viewed straight on, leading to a lack of perspective and depth. While axonometric and isometric projections also allow for the representation of three-dimensional objects in two dimensions, they maintain a specific orientation and scale that does not permit the same flexibility in angle as oblique projection. Therefore, oblique projection stands out for its ability to showcase an object from non-perpendicular angles.