Hypertext is supposed to mimic the associative memory of human beings. road networks. constellations in the night sky. the way that some people ""channel surf"" with a remote control.

Aline ab is in 1st quadrant , its ends a and b respectively are 20mm and 60mm infront of vp respectively . the distance between the end projectors is 75 mm . the line is inclined at 30 degrees to the hp and end a 20 degrees above the hp . draw its projections , find true length