Interactive ceiling design and realization in a foyer of a protestant church. Here people meet before and after the service, and often engage in informal talks, while the children are running around. Because it is often very busy place close attention was paid to the lighting and acoustic conditions. Custom made LED lights with discrete wiring are controllable with a microprocessor (yet to be implemented). This enables to switch between different lighting modes and even use the ceiling for various game purposes at regular youth groups' meetings.