The circular blue and white BMW logo or roundel evolved from the circular Rapp Motorenwerke company logo, from which the BMW company grew, combined with the blue and white colors of the flag of Bavaria. [https://en.wikipedia.org/wiki/BMW#Roundel_logo ]
Snooker is played using a cue and 22 snooker balls: one white cue ball, 15 red balls worth one point each, and six balls of different colours: yellow (2 points), green (3), brown (4), blue (5), pink (6) and black (7). [Wikipedia]
Historically, indigo was a natural dye extracted from plants, and this process was important economically because blue dyes were once rare. Nearly all indigo dye produced today — several thousand tons each year — is synthetic.
"Blue and white wares" (Chinese: 青花; pinyin: qīng-huā; literally "Blue flowers") designate white pottery and porcelain decorated under the glaze with a blue pigment, generally cobalt oxide. [wikipedia]
