View source for Left vs. Right

<dl><dd> Up to <a href="/index.php/Bang_14" title="Bang 14">Bang 14</a> Hail to the BANG.  Back to <a href="/index.php/Texas_Trade_%27em_Pregame" title="Texas Trade 'em Pregame">Texas Trade 'em pregame</a>.  Forward to <a href="/index.php/Spiral" title="Spiral">Spiral</a>.
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: Up to <a href="/index.php/Bang_14" title="Bang 14">Bang 14</a> Hail to the BANG.  Back to <a href="/index.php/Texas_Trade_%27em_Pregame" title="Texas Trade 'em Pregame">Texas Trade 'em pregame</a>.  Forward to <a href="/index.php/Spiral" title="Spiral">Spiral</a>.


http://isotropic.org/bangwiki/left-vs-right.png

This puzzle is based on [http://www.cs.indiana.edu/~hfoundal/research.html Bongard problems], where the goal is to figure out what the six patterns on the left have in common that the six patterns on the right do not.  (If you like this kind of thing, this page indexes [http://www.cs.indiana.edu/~hfoundal/res/bps/bpidx.htm lots more].  My favorite is [http://www.cs.indiana.edu/~hfoundal/res/bps/doughof/p144.htm number 144].)

In this puzzle you get eight of the twelve patterns and you have to fill in the missing four.  Once you do that, the light blue shapes will form letters (you may need to squint) spelling out SUBURBAN.


* [http://isotropic.org/bangwiki/left-vs-right.pdf the puzzle sheet]
* [http://isotropic.org/bangwiki/left-vs-right-pieces.pdf the pieces you need to add]
* [http://isotropic.org/bangwiki/left-vs-right-hint.pdf the hint sheet]
* [http://isotropic.org/bangwiki/left-vs-right-solved.pdf the solved puzzle]
* [http://isotropic.org/bangwiki/left-vs-right-playtest.pdf the playtest version].  After the playtest we made it larger (11x17; the playtest version was 8.5x11 so the pieces were ''tiny''), added a title in the answer color and "font" to suggest what you were looking for, made the drop shadows more prominent and added the dotted lines (playtesters had some problems orienting the pieces), and changed the bottom-right problem entirely.  We also changed the answer word (it was previously INSIGNIA, a connection to the Presidential seal printed in the corner).