Decay

 Decay refers to how quickly the sound levels off to a sustain level after the initial attack peak. pg. 57

This is a description of the envelope of a sound or the ADSR (Attack, Decay, Sustain, Release) 

The time it takes for reverberant sound to decrease to 60 dB below it's original level is called its decay time or reverb time and is determined by the room's absorption characteristics. The brain is able to perceive the reverb time and timbre of the reverberation and uses this information to form an opinion on the hardness or softness of the surrounding surfaces. pg. 71

Modern Recording Techniques 7th edition David Miles Huber/Robert E. Runstein

I'm curious about the implications of sound being able to decay in the material sense similar to Fibers when they have been exposed to harsh environments. The section on hardness and softness echoes my interest in perception of texture- but its interesting to think about the comparison of how we see/feel/hear texture. Optic/Haptic/Sonic. This is further complicated by the idea of visually implied texture. Is there a sonically imply texture? Acousmatic sound maybe?