Harmonics

It seems like there are events - trends - that repeat throughout the cycle , and not where you expect - halfway through, say, and half as intense.

Bush attacks Iraq because he equates Kuwait to Czechoslovakia 50 years before - and perhaps to avoid becoming the next Chamberlain. American Bandstand is reflected by TRL 40 years later; folkies show up in the middle of the Crisis but just on the margins.

There's a term for this in wave theory and perhaps it should be no surprise that it shows up here.