That's an excellent question about a detail many of us notice while using public spaces. Generally, the vast majority of standard public park benches have fixed, non-adjustable backs. Their design prioritizes durability, vandal resistance, low maintenance, and universal accessibility, making adjustable mechanisms less practical for high-traffic areas.
However, the concept of adjustable angles is more common in specialized settings. You might find benches with multiple fixed recline positions in some therapeutic gardens, senior living areas, or dedicated contemplation spaces. For personal use, such as in a private garden or on a patio, numerous commercially available benches do offer adjustable backrests, allowing you to find the perfect lounging angle.
If you're seeking a more comfortable public seating experience, look for benches with ergonomically contoured backs or those designed with a slight, permanent recline. Some modern public furniture installations also feature segmented or curved seating that provides varied support points. While you typically cannot change the angle of a standard park bench, understanding these design variations can help you select the most comfortable spot for your relaxation.