Of the three days I spent in Chicago earlier this month, it rained every damn day. Seeing as how it's considerably more annoying to take photographs while holding an umbrella, and that excessive moisture in the air seems to drive down the quality of the photos I take, it was not very pleasant. The transition from overcast to driving rain was always rapid, too. Twenty minutes in the Adler Planetarium was enough for me to bridge the gap from "grey but okay" to driving rain.
I actually think that, in this circumstance, it actually improved this photo of the Chicago skyline from what it might have otherwise been.
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