In the Valencia (2001) installation "Kaplegraf / Techet reka Volga", 30 "drop devices" were following the song about the river Volga, which was presented on the big projection.	"Kaplegraf / drops ofreason" had the ability to count : for example 2x2 - the Water will "answer" with the correct numbers of drops - 4 . Here Kaplegraf was operating in an " interactive" (keyboard mode) and in a "demo"(voice mode).