hand-clapping

Other behaviors to adopt include making noise, like hand clapping at regular intervals, especially on trails without good sight lines.

Disentangling the way we perceive silence is like a Zen koan for neuroscientists—they must literally confront the sound of one hand clapping.

"In the end, this trial may be like 'the sound of one hand clapping,'" Epner wrote.

The Zimbabwean game song “Sorida” contains a melody accompanied by body percussion and hand clapping in pairs of partners.

Usually the audience, busy filming on their smartphones, just offers the sound of one hand clapping.