In a message dated 10/20/01 5:27:47 PM Eastern Daylight Time,
PrimaryE@aol.com writes:

<< Previous to teaching perspective I have the students do line drawings.
One
drawing has all parallel lines and one drawing has all perpendicular lines.
I give the students three rules. 1. All horizontal lines are parallel
2. All vertical lines are parallel
3. All vertical lines must go back to the point.
4. You can put in the horizontal lines or vertical lines
where you wish, but all vertical lines must go back to a point on the
horizon line. >>

I reread what I wrote before and it seems that in my haste I made some
mistakes. There are 4 rules. #3 should read.....All diagonal lines should
go back to the vanishing point. #4 should read....You can put in the
horizontal lines or vertical lines where you wish, but all diagonal lines
must go back to the vanishing point or points on the horizon line. Sorry
fellow teachers...You must think I'm an idiot.