More so than anything else, the choice of colors really creates a sense of the time period - two shades of orange, a goldish yellow, and bubble gum pink, suggesting a bright, somewhat innocent mood. And placing the title in cartoon speech bubbles suggests that promises are made, but perhaps in a not too serious way.
The cast, the score, and the book by Neil Simon was enough to attract me without any of this. I can only assume that this is the same for people who follow theatre closely. But for the general population, this is certainly, so far, a smart campaign, including downplaying Simon's role at this time, considering his most recent track record with ticket buyers. I expect that should the reviews be good, suddenly his name will again appear and be mentioned aloud.
So far, Promises, Promises is full of - you guessed it - promise. Sorry... :-)
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