Miket, The green and red boxes are just visuals. Mobius calls them hot air but included them for the visually impaired. There are many variations of the script floating around, Read the notes and comments where you found the study in the Onenote. They do not show support or resistance as BenTen noted. They also have nothing to do with direction. That is why Mobius mentioned other studies to go along with the ECI. I don't use them but was around for their creation and hacking by others.
I could have made it shorter if I had just included this directly from the script: ECI plots the areas where price becomes compressed with colored and clouded bands.