abstract agitated agitation bubbles bubbling contaminated contamination edge edges edging flow flowing foam foaming froth frothing frothy inlet light mixed mixing pattern patterning patterns polluted pollution soft stirred stirring stream surface surfaced surfaces swirling swirls texture textured textures toxic toxicity variation varieties variety water white angles appearance barriers block blocks boundaries circles circular coloring colors colouring colours constructed contrast contrasts cracks discoloration divided dry garden leaves moss path pathway plants ringed rings sectioned sections shade shadow shadows shrubbery shrubs stepping-blocks sunlight sunshine trees wood wooden appearances architectural architecture box-like buildings business-district CBD city city-scapes city-views concrete contemporary contrasting distance distant elements exterior external glass height high high-rise linear lines modern office-buildings perspectives reflections skyscrapers tall views walls wealth windows backdrop background boat color coloration colored colorful colour coloured colourful creased creases crinkled dark decorative feel fold folded folds materials origami paper paper-boat paper-folding red skill skilled skills tactile thick thin touch yellow