From my book on The Balkans
In the main square the fountain next to the Alexander the Great statue was now coming into its own as night fell. There were sixty small holes in the main square, six rows of ten out of which water would pour. Each hole contained a light that could switch colour. The water could either shoot out vertically, to a height of about six feet, or at an angle of about 45 degrees, so that it appeared to be jumping into another hole close by. This display of playing streams of water was choreographed to the accompanying music. The jets would play at the same height and then gradually decrease from one end to the other in a line, so one jet at the end of a line would have completely disappeared whilst the jet at the other end was still playing to a height of four feet. All the time the colours in each of the lines was changing. This fountain drew a large crowd, some of whom thought they could run through the fountain without getting wet. They were wrong.