The problem is with the verb ‘running’ in the progressive  form. 
With the verbs ‘running’ and ‘riding’ in the active sense, we can get  
structures similar to that in question: 
I am running home. 
I run home all the time. 
Running home am I. 
The boy is riding down the street. 
The boy rides down the street every day at 5. 
Riding down the street is the boy. 
*The red marks are running all down my essay. 
The red marks run all down my essay. 
Running all down my essay are red marks. 
The objection (from Bruce, I think) is that you do not typically use  ‘running
’ in the sense of denoting a location (not even a path) in the  progressive 
form.  So here are the  two possibilities that I can see: 
1.  The most obvious is that  “running” is part of the verb (as Eduard 
suggests) in the way that ‘ride’ and  ‘run’  are parts of the verb in  examples 
above.  The base form in  the progressive is odd, at best, and unacceptable at 
the least. 
2. Another possibility is that ‘running’ introduces some sort of locative  
phrase or idiom or complement, which is what I think the other contributors 
were  suggesting. 
The hairline runs from here to there. 
Running from here to there is a hairline. 
*A hairline is running from here to there. 
Intriguing. 
Linda DiDesidero

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