accommodation angles architecture box-like boxed bricks brickwork building building-construction building-site building-work buildings concrete concreting construction development distinctive elements exterior external gray grey height high home house light linear lines modern modernistic perspectives plain second-storey second-story squared straight structured style suburban two-storey two-story units urban views wall walls windows work home-units background birds brown buff Camouflage camouflaged climate-tolerant common common-pest contrast dark ever-expanding-populations fauna house-sparrows insect-eaters introduced-species Luke 12:6-7 Matthew 10:29-31 mottled Old-World-sparrows passer-domesticus passerine-birds pavement pest plump powerful-beaks prolific seed-eaters small social sparrow sparrows textures true-sparrows two-a-penny worldwide-distribution breadcrumbs climate tolerant ever-expanding populations feeding house sparrows Matthew 10:29 passer domesticus paving cement-mixers construction-site construction-work framework homes men metal-work mixers pipes rubble safety sand structure untidy window-frames workers workmen