Playgrounds with spiral slide

 

— a slide twisted into a spiral (around a vertical axis). Such a form is very funny and interesting for children, in addition, it also has quite a practical advantage: with a sufficiently large length of the “trajectory”, the overall dimensions of the slide itself are quite small. At the same time, for a number of reasons, spirals are practically not used on their own, usually they are supplemented with a straight or wavy slide, or even both at once.