2 Quotes by Wikipedia :-)

The persona of Beyoncé Knowles, "Sasha Fierce", appears on the album I Am... Sasha Fierce. According to Beyoncé, Sasha is her wilder side, emerging during high octane stage performances and serving as a sort of scapegoat for "unladylike" behavior.[9][13]

Peter Drucker suggested the transformation into a post-modern world happened between 1937 and 1957 (when he was writing). He described an as yet "nameless era" which he characterized as a shift to conceptual world based on pattern, purpose, and process rather than mechanical cause, outlined by four new realities: the emergence of Educated Society, the importance of international development, the decline of the nation state, and the collapse of the viability of non-Western cultures