Euler's number [read everything]

Challenge #10 in the Symbols series. Hosted by nDray.
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Show us something where the euler's number is clearly meant, not just pictures of "e". This can be easily found in math books, but not only! Additionally, if you find something in nature, or day to day objects, where e's properties are implicit, please show, but explain.
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Melk Abbey on the Danube
Euler Spiral from another angle
Euler's Number
At Anchor
Euler shows some Roman friends his new "e" number ;-)
Albany Hotel Stairway - Rome, Italy
Emergency staircase of Paris University's math library
Euler's dream
Euler_7753
Catenary curve
E-staircase
Euler's inspiration
Euler_N
Einstein Honors Euler
e paper
I can't live without it
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