The family of deer that "moved in" next to the Iowa data center [1] also looks quite photoshopped...

[1] https://www.google.com/about/datacenters/gallery/#/places/2

Definitely not photoshopped. I see these deer everyday. In fact, there are quite a few more now.

I have to wonder if they photoshopped that not to make things look symmetrical but to hide some kind of trade secret.

If you look at the picture below, there are blue blankets covering some of the racks. Gotta wonder if under those blankets are something they don't want other companies to know about: https://www.google.com/about/datacenters/gallery/#/all/2

NSA is really keen on branding all their interfaces and hardware with their proprietary logos.

We do a lot of photo shoots for our furniture products. The Photoshop team usually will mirror one side of the sofa with other to make the pictures look symmetrical and nicer. I won't be surprised if the pictures are photoshopped to make them symmetrical to give them a less messy look.

If you look at the photo it's just three sets of racks that have been mirrored to the other side; the ones with the orange lights and red cables. None of the other racks looked mirrored.

Now that you mention it I remember that the mirroring was done to hide a gap in the racks on the right!