In this paper we introduce CoBoard1 Flowers, an audio-visual public installation for Prague Spring International Music Festival. An interactive visualization with floral motifs is shown and is controlled by a face detection technology, enabled by a computer vision algorithm. The visualization is controlled by the estimated position, distance, gender, and age of the participants. The visualization is accompanied by adaptive music. The solution has been qualitatively evaluated (N=6). The installation has been used in the total of 453 interactive sessions during 14 concert evenings.