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

arch arches architecture asphalt beds bent beveled bollards circle concrete construction corner curb curved differ differences edging excavation fence flower flowerbed flowerpot garden gray height installation line made masonry modeling ornamental palisade palisades park pathway prefabricated raised retaining road roadside roundabout sidewalk site slated slope slopes sloping smaller soil solution square squareprofile staircase strong support terrain tilt track various wall