A Long Dress

THAT is the current that makes machinery,
that makes it crackle,
what is the current that presents a long line and a necessary waist.
What is this current.
What is the wind, what is it.
 
Where is the serene length,
it is there and a dark place is not a dark place,
only a white and red are black, only a yellow and green are blue,
a pink is scarlet, a bow is every color. A line distinguishes it.
A line just distinguishes it.