grass green hanging maple rope swing summer sunny day swing tire tire swing toy tree climb climbing escape knots ladder rope sky swinging twine bridge cables mesh movement slats suspension bridge swaying swinging bridge wooden flooring boys care children community enjoying enjoyment fun grassed area high kids park play play-area playground recreation recreational safety sand sandpit suburban suburbs supervision swings autumn branch branches fall HDR lawn leaf leafs Nyberg sun sunlight sunrays walnut blue chain chains child chute pla red rust rusty steps yellow