Try taking a swim in the pool and observe interference pattern at the floor of the pool . For best effect it has to be at night. At the edge of the pool the joints between two tiles produce single slit diffraction pattern , therefore circular wavefronts are observed. The neigbouring circular wave fronts will interfere producing constructive and destructive interference pattern. These patterns may be difficult to observe because the source is not coherent( meaning that the waves reaching the sides ) are made by swimmers who may not be splashing at a constant rate (same f). Non coherent sources produces interference patterns that are said to be not observable . You can still observe non permanent interference pattern in the swimming pool as they are slow water waves . If the waves are sound or light than non coherent sources cannot produce observable interference pattern.
Don't forget to bring goggles to the swimming pool!
