Graphics demo that draws a "moving pathway", adding to the front and
removing from the tail (sure is hard to come up with verbal descriptions of
these things!).  

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  167     236  70.8% -lh5- 3773 Jan 22  1986 sparks/README
[generic]                 5801   13340  43.5% -lh5- 73d3 Jan 22  1986 sparks/sparks
[generic]                 2345    7093  33.1% -lh5- ffbc Jan 22  1986 sparks/sparks.c
[generic]                 8632   18952  45.5% -lh5- e0ab Jan 22  1986 sparks/sparks.crash.3.03
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files   16945   39621  42.8%            Jan 22  1987