http://drawsketch.about.com/library/weekly/aa021603a.htm

Linear Perspective is a geometric method of representing on paper the way that objects appear to get smaller and closer together, the further away they are.

http://wiki.answers.com/Q/What_is_isometric_drawing

Isometric Drawing is a form of three-dimensional projection in which all of the principal planes are drawn parallel to corresponding established axes and at true dimensions; horizontals usually are drawn at 30° from the normal horizontal axes; verticals remain parallel to the normal vertical axis.

http://library.thinkquest.org/TQ0310106/oblique.html

Oblique drawings are designed to show a three dimensional view of an object. The width of the object will still be drawn as a horizontal line, but the depth can be drawn back at any angle.

http://www.cdli.ca/depted/g7/ortho.htm

In simple terms, orthographic drawings are views (front, side, top, and so on) of an object. An orthographic view is only one side.

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