If you have two portals with one exactly on top of the other, it's as if you can do as many crossed links as you like, all to the same point.
This opens the door for some beautiful cross-faction artwork, but also for some single-faction fielding plans that would not be possible otherwise.
This video shows how you can make an 8 layer homogeneous field if you have a pair of co-located or doubled portals near you.
It's not just theory! It was accomplished by a group of German and Czech agents on the 19th of January!
Find your own doubled portals using this plugin: http://bit.ly/35TLcu7
See the video report of the 8 layer field: http://bit.ly/L7L8dHCFvideoreport
The written report is available at the following links:
http://bit.ly/OfRainbowsAndPotsOfGold [Part 1 - Inspiration and Planning]
http://bit.ly/L7dHCFsitrep [Part 2 - the Level 7 Field]
http://bit.ly/L8dHCFsitrep [Part 3 - the Level 8 Field]