Images of the Edge Effect: share for teaching & education

Since creating & teaching many permaculture Impress (LibreOffice's answer to Powerpoint) classes I've collected quite the archive of images related to permaculture. I feel it would behoove our online community to share our images for learning & teaching purposes. All images shared with adherence to & respect for attribution: always telling others the source where you got the image.
We can even use the concept of permaculture zones:
Zone 1: share images that you have taken & created of your projects,
Zone 2: share images that you have taken & created of others' projects,
Zone 3: share images from the Creative Commons, Public Domain, & other other copyleft licenses (eg. the WikiMedia Commons),
Zone 4: share images from permaculture websites, this way they can be attributed & it will hopefully draw more attention to their projects,
Zone 5: share relevant images from any other sources. Fair Use Doctrine may apply in the U.S. (and possibly other countries?) for nonprofit educational use.
Without further ado, I'd like to present what images I've collected so far from the edges section of my "Permaculture Principles" class. Note, I've not used all of these images in class, I just saved a lot during my research.
Permaculture Principle 11: Use edges & value the marginal: “Don’t think you are on the right track just because it’s a well-beaten path” -PermaculturePrinciples.com

Instead of a bed with a wavy edge, I went with a whole bunch of tiny beds in the same space to increase the amount of interface between where I was planting clover and the weedy lawn. I won't know until this summer whether the technique is working, but it does illustrate an approach to increased edge per work-shovel.