They're hopping around
in the big brown cello box:
the twittering birds.
Katharina Gross (cello) plays "Aanraken" ("Touch", 2022, Jan van de Putte) and "Vorsicht, Katharina!" ("Watch out, Katharina!", 2019, Jan van de Putte), in the Organpark on April 3rd, 2022
Collection "org anp ark" #194