What??

What am I, but a paper boat,
Sometimes I sink, sometimes I float,

And who am I, but a haunting ghost,
Sometimes you see through me, sometimes you don't,

And what is life, but a colorful kite,
Sometimes it swerves to left, sometimes drifts to right,

And what is happiness, but an interesting mirage,
Things that make us happy the most, are seldom large.