I think that they do what every that they what to do
A box dance: it is a quick dance
I'm guessing you mean in Photoshop so you would
1. click the ruler tool
2. drag it along the line you know is straight
3. on the options bar, click straighten
hope this helps :)
It was sung by Eddie Cochran.
Answer:
red, yellow, black, brown, and violet. No brushes have been found, so in all probability the broad black outlines were applied using mats of moss or hair, or even with chunks of raw color.