Car parks generally do not stand out because of their atmosphere, but – also thanks to P. Struycken’s illuminations – this does not apply to the car park below the Ossenmarkt square. Using twenty light frames on the floor of the car park, the concrete construction in the centre is spotlit in changing colours. The principle of the colour changes is based on the blend of the colours red, green and blue. As the lights shine more or less intensively, the colours change as they blend. P. Struycken is also known from the stamp on which he portrayed then Queen Beatrix in coloured dots and his design of the colour scheme for the rooms in the Groninger Museum.