  This paper is an updated version of a survey on projective configurations of
subspaces in general position. The preceding version was published in Russian
in 1989 and in English in 1990 (in Leningrad Math. J.) opening a new section
``Light reading for the professional''.
  The paper is written in the form of introduction to the subject, with much of
the material accessible to advanced high school students. However, in the part
of the survey concerning configurations of lines in general position in the
three-dimensional space the exposition is free from any background
restrictions. We have added few new results, fixed few misprints and
terminological inaccuracies and expanded the reference list. Notice that some
of the results presented in the paper appeared in other papers without
appropriate references.
