abstract appearance appearances ball blocks child-care children's-toys circular color coloration colored colorful colors colour coloured colourful colours connecting fit fitting foam-rubber games learning mixed mix’n-match playing-blocks puzzles shape shaped shapes soft spikes spiky sponge-rubber tactile texture textures touch touching toys variations variety abandoned brick brown cement cinder cinder block decrepit industrial mason old wall capital city cityscape cloud madrid panorama sky skyline skyscrapers Spain spanish tower blocks urban angle block blue canada glass modern rectangle reflection skyscraper tower vancouver center crossing downtown lights Los Angeles office pavement road street traffic brick house bricks building chimney chimneys flat flats house trees windows background copyspace fishbone mono monoblock pattern red weave buildings corner illusion optical anticipating base construction gray hole holes material patterns roof square structures ancient architecture elements historical masonry secure security stone strength strong