dotted repeatable popart like duotone pattern. speckled red yell

1950s 1960s abstract andy artistic backdrop background circle continuous dots dotted duotone endless fifties flecks free geometric grid half halftone illustration like patern pattern pointilist pointillism pointillist polka polkadots popart repeatable repeating repetitive retro royalty seamless seamlessly sixties speckled specks spots stipple style swatch texture tileable tone vector vintage warhol warhole yellow