I placed this Omaha Art cache to coincide with my Community Celebration Event. I wouldn't recommend a night hunt, as the mural would probably be hard to see. Unfortunately, I don't have any information about the author or the artwork; it seems the website is defunct. If you know something about it, feel free to contact me or post it in your log.
Check out the unique mural at posted coordinates and complete the book cipher to get the coords to the final, which is a simple P&G a short walk or drive away.
The final is located at: N 41° 17.ABC' W 096° 00.DEF'
A = 0
B = [ 2, 3, 2 ]
C = [ 1, 1, 1 ]
D = [ 3, 1, 1 ]
E = [ 3, 2, 5 ]
F = [ 1, 6 ,1 ]
You can check your answers for this puzzle on GeoChecker.com.