calcium can canned clupeidae edible fatty-acids fish food health healthy heart-healthy herring-family nonperishable nutrient-rich nutrients nutritious oil oily-fish omega-3 packed pilchards portable potential sardines self-contained-food small tightly-packed tin tinned tins vitamins 3-D advertising backdrop background blended bright center centre color colour communicating communication design detailed details distinctive gold golden image inform information informing invitation lettering letters light lines medical medical-care medical-services opportune opportunity patients promotion promotional services sign style surface surgery texture textures variety various vibrancy vibrant words roe coloration colored coloured contrast decorative designed for-sale glass glassy metallic patterned patterns perspectives plastic presentation promoting purchasable raised sale semi-transparent shaped shapes shiny suggestive surfaced surfaces surfacing tactile textured thick thin appearance demtal-care dental expressing expression eye-catching identification indentifying indication informative notification notifying rounded alert appropriate-behavior appropriate-behaviour area attention banned cigarettes danger direction directive environment health-risk location no-smoking not-allowed not-permitted permission-denied pollution prohibited prohibition symbol unhealthy warning wording 1 2 3 addition arithmetic basic beginning child children class clay count counting education elementary game grade homework introduction kid kids kindergarten learn lesson math mathematics modelling number numbers numerals numerical order play play doh point preschool primary school schoolwork sequence shape student study subject subtraction teach teacher toy