Why this word is great
ANACAMPTICS — [Noun] The branch of physics concerned with the reflection of light or sound. From the Ancient Greek ἀνακαμπτικός (anakamptikós, "returning, reflective"), from ἀνα- (ana-, "back, again") and κάμπτω (kámptō, "to bend"). Unlike catoptrics, which confines itself to the precise geometry of mirrored light, or acoustics, which encompasses the entire life of a sound, anacamptics is the singular study of the rebound itself. It is the perfect sunbeam glancing off a still pond to stripe a shaded ceiling, the distinct, answering slap of a footstep in an empty marble hall, and the ghost of a voice lingering in a stairwell—the quiet law that nothing departs entirely, but merely bends back toward us, changed.