Entertainment apparatus for a seated user

An entertainment apparatus comprising:

• a seat;
• a first sensor mounted on the seat which is arranged to sense the presence of an object, or movement or position of an object in a non-contact manner, within a sensing region around the seat;
• a processor arranged to perform at least one of:
• receive an audio signal and to process the audio signal based on presence, movement or position detected by the first sensor to provide a processed signal for output to a transducer;
• generate the processed signal for output to the transducer based on presence, movement or position detected by the first sensor;
• control a lighting effect based on presence, movement or position detected by the first sensor
• wherein the seat comprises a nodule shaped to cause a user to sit in a position in which their legs are parted around the nodule, and wherein the first sensor is positioned on the nodule and the sensing region of the first sensor includes the region in front of the nodule.