Tympanum, a cinquain sonnet

Sharp sounds 
impact only 
the thin skin of this drum, 
this timpanum, and then bounce like 
mallets,

making 
music of this 
cave, plucking the threads of 
this skein.  They will have no other 
impact. 

In this chamber, their soft timbres,
their reverberations 
and distortions  
are breath.