Good luck playing L'Histoire du soldat without actively subdividing! There is a problem with us humans. Left to our own devices, we tend to play a dotted eighth sixteenth figure like triplets. In the practice room we can start with TAH-tah-tah-TAH until we can both measure and feel the three sixteenths that make up the dotted eighth. At this point we can "chunk up" from sixteenths to a quarter note pulse, but like a clock chunks up from seconds to minutes to hours, our accuracy depends on the smallest unit chosen.