"....these are representations of Time as 'Kairos;' that is, the brief, decisive moment which marks a turning-point in the life of human beings or in the development of the universe. This concept was illustrated by the figure vulgarly known as Opportunity. Opportunity was show as a man (originally nude) in fleeting movement, usually young and never very old, in spite of the fact that Time is sometimes called πoλιóς (grey-headed) in Greek poetry. His attributes were a pair of scales, originally balanced on the edge of a shaving knife, and, in a somewhat later period, one or two wheels. Moreover his head often showed the proverbial forelock by which bald-headed Opportunity can be seized."