Copyright © 2003 William B. Ackerman


There are several “common spot” concepts available in Sd. They were designed to reflect the way these concepts are used by top challenge callers.

The general way these concepts work is that some or all of the people in the formation are in right-handed miniwaves. They are to act as though they got there by colliding from the previous call, and are to do the “common spot” call as though they hadn't taken right hands, but actually occupied the spot where the previous call would have left them.

               .     .    1B>   1G>
               .     .    2G<   2B<
              4B>   4G>    .     .
              3G<   3B<    .     .
             COMMON SPOT COLUMNS circulate
              3G>   2G<   2B<   1B>
              3B<   4B>   4G>   1G<

There are many concepts in this family. They name the formation that the dancers are supposed to imagine themselves in, as opposed to the actual setup. Sometimes “common spot” is used, and sometimes a more specific designation, such as “common point” or “common end”. In many cases it doesn't matter whether “common spot” or a more specific concept was used.

If the concept names a formation with specific facing direction assumptions, such as “waves” or “1/4 tag”, there will be an implicit assumption given to the computer dancers after they separate themselves. That is, after “common spot waves”, the separated dancers may assume that they are in waves of the appropriate handedness.

Common point galaxy is done from a “rigger” or “bat” setup (box with miniwave “wings”). The wings act as collided galaxy points. The other points are absent.

                    4GV  1B^
            4B^ 3GV          1G^ 2BV
                    3BV  2G^
      COMMON POINT GALAXY galaxy circulate
                    4B^ 1G^
                 4GV       2G^
                    3GV 2BV

Common point diamonds and common spot diamonds are they same. They are done from the setup obtained by doing a 6x2 acey deucey from facing diamonds.

                    .        4B>
                    .        2G<
                3B^  1G^  3GV  1BV
                   4G>        .
                   2B<        .
     COMMON SPOT DIAMONDS exchange the diamonds 1/4
                   3B>      1G>
                2B^  4G^  2GV  4BV
                   3G<      1B<

Common point hourglass and common spot hourglass are similar.

                    .    4B>
                    .    2G<
                3B^         1BV
                   4G>    .
                   2B<    .
     COMMON SPOT HOURGLASS unwrap the hourglass
              2G<   2B>   3B>   3G<
              1G>   1B<   4B<   4G>

Common spot point-to-point diamonds are done from point-to-point diamonds in which either the interior points have collided or the centers of each diamond have collided. The latter situation can arise from partial exchange the diamonds. It can not arise from a diamond circulate, because the Callerlab definition specifically makes the dancers recenter themselves.

                   .         3B>
                   .         2B<
               2G^   3GV  1G^   4GV
                  4B>         .
                  1B<         .
                2G>            1G>
            1B^     4B^    2BV     3BV
                3G<            4G<

            4B>                    1G>
                4G^  3BV  1B^  2GV
            3G<                    2B<
                4G<            1B>
            3G^     4BV    2B^     1GV
                3B<            2G>

Common spot 1/4 tags and common spot 1/4 lines are done from a tidal wave. The live dancers imagine that they have collided in the center wave or 2-faced line. The name of the concept determines how they collect themselves into groups, in case that matters. Nothing is implied about the facing directions of the phantom outsides. You may add something like assume 1/4 tags or assume normal diamonds if you wish.

     4B^  3GV  4G^  3BV  1B^  2GV  1G^  2BV
     COMMON SPOT 1/4 TAGS fall into a column
                   4B^   1G^
                   3B^   2G^
                   4GV   1BV
                   3GV   2BV

     4B^  3GV  4G^  3BV  1B^  2GV  1G^  2BV
     COMMON SPOT 1/4 LINES, ASSUME 1/4 LINES, make a pass
                   1B>   4G<
                   3G<   2B>
                   4B<   1G>
                   2G>   3B<

The various types of common spot lines concepts may be done from a 2x4, 2x6, or 2x8.

From a 2x4, everyone has collided in the center. The ends of the imagined lines are all phantoms. You may use common spot or common center, indicating either lines or waves. If you indicate waves, there will be an implicit assume waves on the result.

               3G^   4BV   2G^   1BV
               3B^   4GV   2B^   1GV
         COMMON CENTER WAVES touch of class
               4G^   1BV   4BV   1G^
               3GV   2B^   3B^   2GV

From a 2x6 that is a parallelogram, the “wings” are ends that have collided, and the center box are normal centers. You may use common spot lines or common end lines.

          .     .    3B^   4GV   2B^   1GV
         3G^   4BV   2G^   1BV    .     .
        COMMON END LINES switch to an hourglass
                   3BV       4G^
                      3G^ 1GV
                   2GV       1B^

From a 2x6 that has only the outer triple boxes occupied, everyone are ends that have collided. You may use common spot or common end, indicating either lines or waves. If you indicate waves, there will be an implicit assume waves on the result.

         4B^   1BV    .     .    4G^   1GV
         3G^   2GV    .     .    3B^   2BV
           COMMON END WAVES scatter scoot
               4GV   1B^   1G^   4BV
               2B^   3GV   3BV   2G^

From a 2x8 that has everyone in a miniwave with someone, with those miniwaves arranged as either a fully offset parallelogram or as a “miniwave zipper”, everyone has collided on the spot in the imagined 2x4 that corresponds to the location of their miniwave in the actual 2x8. You may use common spot lines, common spot waves, or common spot two-faced lines. If you indicate waves or two-faced lines, there will be an implicit assumption on the result, and people will be grouped in a way consistent with that, in case it matters.

       .     .    3G^   4BV    .     .    2G^   1BV
      3B^   4GV    .     .    2B^   1GV    .     .
        COMMON SPOT TWO-FACED LINES double down
               2GV   3BV   3GV   2BV
               4B^   1G^   1B^   4G^

       .     .    3G^   4BV    .     .    2G^   1BV
      3B^   4GV    .     .    2B^   1GV    .     .
            COMMON SPOT WAVES double down
               2GV   3BV   2B^   1G^
               3GV   4BV   1B^   4G^

       .     .     .     .    3G^   4BV   2G^   1BV
      3B^   4GV   2B^   1GV    .     .     .     .
              COMMON SPOT LINES presto
                     4B^   3BV
                     2GV   1G^
                     3GV   4G^
                     1B^   2BV

The common spot columns concept may be done from “clumps”, “stairsteps”, Z columns, or waves. From waves, everyone has collided and are the centers of the imagined columns.

From “clumps” or “stairsteps”, everyone has collided.

               .    4G>    .    4B>
               .    1B<    .    1G<
              3G>    .    3B>    .
              2B<    .    2G<    .
      COMMON SPOT COLUMNS cross your neighbor
         2BV  3G^  1BV  4G^  2GV  3B^  1GV  4B^

From Z columns, some people (those that aren't centered) have collided, and the others are normal.

               .    4G>    .     .
              1G>   1B<    .    4B>
              2B<    .    3B>   3G<
               .     .    2G<    .
         COMMON SPOT COLUMNS follow thru
         2B^  1BV  1GV  4GV  2G^  3G^  3B^  4BV