angles appearances architectural architecture box-like buildings business-district city city-scapes city-views color colour contemporary contrast contrasting distance distant elements exterior external glass gray grey heights high high-rise Hong Kong light linear lines modern office-buildings perspectives rectangles rectangular skyscrapers style views walls wealth windows active activities adventure adventure-playground children children’s-playground climbing climbing-platform curved curves equipment families fun kids leisure lookout observation-platform park path paths peaceful people perspective picnic playground playing public quiet rails relaxing safety shade shaded shadows shady sheltered stairs steps sunlight sunshine tranquil trees view viewing-platform visitors wood wooden cliff coast coastline look out ocean picturesque ponder pondering sea sky surf colorado Denver mile high city mountains panorama Rocky Mountains skyline usa