CICHO (SILENCE!) sign under the ceiling of Chłodna 25 club had been designed to remind guest to be quiet during the "quiet hours" (which is from 10pm to 6 am in Poland). People living above the club had been systematically complaining about the noise, so the sign has been designed as the spech baloon pointed up, as a shout from above. Designed to be automatically turned on and off by the timer.