if FUTSOL is to SOCCER;
then BEACH VOLLEYBALL is to INDOOR VOLLEYBALL
Several years ago, when the Brazilians were dominating soccer, the world looked closer at what they were doing. it turns out the country has lots of ghetto where there aren't many big grass fields for soccer, so they had to shrink the courts to less than a basketball court. They called this futsol. As a result of Brazilian players competing in this shrunked arean, the players learned to fake out opponents in tight quarters. And when the players were re-introduced to the HUGE pitch (relatively), they were able to fake out their opponents with more ease because of the increase in space.
It's worth noting that there's a soccer futsol league on Maui...i've heard one of the best in the country.
Beach volleyball reminds me of this. The sand court is shorter -- 730 square feet to 900 square feet.