Playground bars. "Playground" is also used as a metaphor to describe a place for some types of play. For example, a laboratory may also be referred to as playground for a scientist. Playground A playground, playpark, or play area is a place specifically designed to enable children to play there. It is typically outdoors. While a playground is usually designed for children, some target other age groups. Berlin's Preußenpark for example is designed for people aged 70 or higher. A playground might exclude children below a certain age. Modern playgrounds often have recreational equipment such as the seesaw, merry-go-round, swingset, slide,
Known Space Nebula, Hugo, and Locus best novel awards. "Protector" (1973) and "The Ringworld Engineers" (1980) were nominated for the Hugo and Locus Awards. Niven has described his fiction as "playground equipment", encouraging fans to speculate and extrapolate on the events described. Debates have been made, for example, on who built the Ringworld (Pak Protectors and the Outsiders being the traditional favorites, but see "Ringworld's Children" for a possibly definitive answer), and what happened to the Tnuctipun. Niven also states that this is not an invitation to violate his copyrights, warning potential publishers and editors not to proceed without permission. Niven was