Sure, you could buy your kid a boring old play set, one with swings and a slide. It'll probably be made of wood and will look just like the play sets in everyone else's backyards. Or, you could buy the crazy-looking Nexus Core.
These play set feature climbing poles, climbers, perches, nets, climbing wall and banister rails in a multitude of colors and materials, put together to look like something dropped out of a passing alien spacecraft. Does that make it more fun? Maybe. But it definitely makes it more expensive.