make the rubber band a "flat" surface so bounce is a bit more predictable. This is mostly just for testing. It looks a bit odd walking on it, and unpredictable bounce might even be just fine...
foreach(dir
British
Classic
Default
Default_es
Default_ru
Default_uk
HillBilly
Mobster
Pirate
Robot
Russian
Singer
Surfer
)
add_subdirectory(${dir})
endforeach(dir)