"Nothing could appear, the word “appearance” would make no sense, if recipients of appearances did not exist — living creatures able to acknowledge, recognize, and react to — in flight or desire, approval or disapproval, blame or praise — what is not merely there but appears to them and is meant for their perception. In this world which we enter, appearing from a nowhere, and from which we disappear into a nowhere, Being and Appearing coincide… Nothing and nobody exists in this world whose very being does not presuppose a spectator. In other words, nothing that is, insofar as it appears, exists in the singular; everything that is is meant to be perceived by somebody… Plurality is the law of the earth''.

Arendt

https://www.themarginalian.org/2015/10/14/hannah-arendt-life-of-the-mind-being-appearing/