two different sized duplicates of a combination of different sized circles

two duo pair pairs black bigger smaller compare comparison comparing backdrop background computer generated graphics illustrations isolated three dimensional dimension combinations combo combos combination identical size sizes sized circle circles colours colors centered center offset optical illusion illusions mind trick tricks visual vision loop looping loops downward spiral spiraling abyss twirl swirl twist twisting wreathe snake snaking gyrate pattern patterned patterns red bright vivid saturated vibrant maroon dark darker light lighter orange tangerine yellow beige