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 architecture backdrop background beige brick brickwork cement color colored colorful colors colour coloured colourful colours concrete irregular limestone mason natural rock solid stone stone wall structure structures tile wall wallpaper black dark form grey heavy marble Mineral minerals nature old ore stonecutter stonemason crimson red rusty brown pastel appearance appearances blue bright contrasting curved curves floral flowers horizontal interconnected interlinked intertwined interwoven linear lined lines patterned perspectives green light brown