I have always described the Whispering Wall as a means (or organ, or instrument) to (re)produce chains of thoughts, considering thinking an essential part of the work.
To the Czechoslovakian philosopher Vilém Flusser (1920-1991), thinking is a process of words, and ‘Whispering’ a primary articulation of a web of thoughts, before spoken or written language *1).
That’s beautiful. A Whispering Wall is a Thinking Wall.
*1) Vilém Flusser, On Doubt, translated by Rodrigo Maltez Novaes, Univocal, Minneapolis, 2014, p. 31.