playground designed without considering these children's needs may not be accessible or interesting to them. Most efforts at inclusive playgrounds have been aimed at accommodating wheelchair users. For example, rubber paths and ramps replace sand pits and steps, and some features are placed at ground level. Efforts to accommodate children on the autism spectrum, who may find playgrounds overstimulating or who may have difficulty interacting with other children, have been less common. Natural playgrounds "Natural playgrounds" are play environments that blend natural materials, features, and indigenous vegetation with creative landforms to create purposely complex interplays of natural, environmental objects in ways that challenge and fascinate children and teach them about the wonders and intricacies of the natural world while they play within it. Play components may include earth shapes (sculptures), environmental art, indigenous vegetation (trees, shrubs, grasses, flowers, lichens, mosses), boulders or other rock structures, dirt and sand, natural fences (stone, willow, wooden), textured pathways, and natural water features. Themed and educational playgrounds Some playgrounds have specific purposes. A traffic park teaches children how to navigate streets safely. An adventure playground encourages open-ended play, sometimes involving potentially dangerous objects such as fire or hand tools. An obstacle course or ropes course is designed to focus participants' attention on accomplishing a pre-determined challenging physical task. A trampoline park provides trampolines. Playgrounds for adults China and some countries in Europe have playgrounds designed for adults. These are outdoor spaces that feature fitness equipment designed for use primarily by adults, such as chin-up bars. Playgrounds for older adults are popular in China. Seniors are the primary users of public playgrounds in China. These playgrounds are usually in a smaller, screened area, which may reduce the feeling of being watched or judged by others. They often have adult-sized equipment that helps seniors stretch, strengthen muscles, and improve their sense of balance. Similar playgrounds for adults have been built in other countries. Berlin's Preußenpark for example is designed for people aged 70 or higher. See also Buddy bench Chin-up bar Children's street culture Children Youth and Environments Journal Cold War playground equipment Home zone/Play street Playground game Playground song Playground Surfacing Playscape Playtime Playwork Recess (break) Rubber Mulch References Ajzen, I. (1991). The theory of planned behaviour. Organisational Behaviour and Human Decision Processes, 50, 179-211. Biddle, S. J., & Mutrie, N. (2001). Psychology of physical activity: Determinants, well-being and interventions. Abingdon: Routledge. Ekeland, E., Heian,