palisades made of square-profile concrete with sloping staircase arches in garden architecture. solution of smaller terrain differ

arches architecture asphalt beds bent bollards circle concrete construction corner curb curved differ differences edging excavation fence flower flowerbed garden gravel height installation made masonry modeling new ornamental palisade palisades park pathway pole pot prefabricated profile public raised retaining road roundabout sidewalk site slope slopes sloping smaller soil solution square squareprofile staircase strong support terrain track various wall