Ruby should take a closer look at that pipe. Is the blue stripe painted on, or is that a window to the interior? If the latter, what's in there?

Not a bad idea. Check the blue stripe on the tube.

>Ruby should take a closer look at that pipe. Is the blue stripe painted on, or is that a window to the interior?
Upon close inspection, the pipe running from the ceiling to the east wall is painted with a blue stripe, probably for identification purposes.

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