Early a.m. May 2, 2012, I had the following dream:

I found myself on the sidewalk of a city street in a major metro area. My strong impression was that it was Philadelphia. Though I have no idea really what direction I was facing, for the reader's sake, I will say I was on the west sidewalk on the south end of a city block. There appeared to be older buildings on both sides of the street, like historic brick row house that ran the full length of the block. These buildings were about six to eight stories tall. There was a paved (not brick or cobblestone) street that ran through the middle, and there were a few people milling around, crossing the street etc, but not very close to me. It was quiet, there were no sounds. There was diffused daylight light coming down from overhead. Possible afternoon sun.

I was a stranger to this place, but I was with someone who understood that I did not know where I was or what I was looking at. It was a woman whom I did not know. She was maybe middle-aged, shoulder length dark hair, wearing a dark blue dress that went a little below the knees. She was in my peripheral vision to the left and facing me. She was my guide, kind of. She helped me “understand” things, versus discussing them. I'm not sure that we actually even spoke to each other.

I looked up into sky and “understood” that this city block was like an old historic city “Arcade”. Not a gaming arcade, but where the buildings on either side of the street are covered with a glass roof and there's an entrance on each end of the street granting access in and out. The entire street and buildings were 'sealed' as it were, though I couldn't see the glass at the top as it was clear and without any visible support structure spanning the street. 

Then I was made to “understand” why we sealed in here:

It was not "safe" outside this city block because of some kind of severe toxicity. The air outside was toxic. We were in a small section of the city that was hermetically sealed. It was really just a block long street. My sense in the dream was that there were not many other places in the city sealed like this, possibly none. 

The noticeable “vibe” of the place was one of ominous nervousness. People were nervous in here and it made me feel nervous, though I didn't feel I was personally in danger. One was apparently “safe” inside this area. My guide did not seem nervous. She was really distant to me (reluctant to engage me) and somber. (like the man in the Dream of the Atrium.

Upon looking up, I then saw the strangest part of the dream. Way up there at the top, were metal gridded racks, square and very large, hung vertically like laundry between the two sides of the street and right down the middle. Each one looked like a huge cooling rack you would put cookies on when they came out of the oven. They were hung and ran  the whole length of the street from one end to the other. It was a continuous row of these strange racks. How they were actually hung up there I couldn't see. They hung perpendicular to the direction of the street, one rack after another, fairly close to each other. There were lots of them. These racks seemed to be about 4-5 meters square, though that's a rough estimate from my vantage point down below. They were very large.

The dream got even stranger and this was really the main focus of the dream. Attached somehow to each rack was a giant dark green leaf as large as the rack itself. They looked like a spinach leaf, sort of.  They were a beautiful dark green color. They were not sandwiched between two racks, but each leaf was attached to its own rack, somehow. They were growing up there on the racks, close to the sun. I suppose that they were hung high up at the top to get as much sunlight as possible. It was kind of like hydroponics, but I didn't see a watering system.

Then I “understood” what these were really were. These leaves were food that was being grown in here, like a giant green house. It was being grown in here because outside was not safe. You could not grow food outside because the air was toxic and dangerous. These plants were super important as food.

Then I 'understood' something else:

Not everyone could grow these leaves. You had to be 'registered'. That was the exact term my female "guide" used. "Registered" with whom, I had no idea, but this also contributed to the tense atmosphere. 

The dream ended.

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Special notes:

Philadelphia apparently had the first Arcade (an enclosed glass-roofed shopping area) in the USA and it was on Chestnut Street.  It was built in 1827, but then demolished in 1860, 

Independence Hall and the Liberty Bell both have their addresses on Chestnut Street in downtown Philadelphia. The arcade was a block away.

I'm certain that I was in Philadelphia. There is a strong similarity between the environment in the dream and the message of the Lord Jesus to the Church of Philadelphians in Revelation 3:7 ...

"And to the angel of the church in Philadelphia write: 'The words of the holy one, the true one, who has the key of David, who opens and no one will shut, who shuts and no one opens."