Magic Station: The Line Of Illusion

Hey, buddy. Come and read a simple illusion trick if you're bored. Come! Well, first, you draw two lines that are the same length. Like this:

_____________________________
_____________________________
Then, draw two arrows at each side of each line. But one line's arrow must be in diffrent direction! Follow this if you don"t understand:

<_____________________________>
>_____________________________<
Hey! Why does it seem on this line it's longer on that arrow, but that line is longer on that arrow? Draw in your papers and you'll see why!