In one form I am very tall, in another, elegant
In one form I am happiness, in another, an eyesore
In one form I am metal, in another, paper
In one form Sasaki's lament, in another Greek ingenuity
In one form I am kung-fu, in another I am strong and static.
What am I?
As usual, please post your answer in spoiler tags. For bonus magical unicorn points, what does each line mean.
Hint:
Sasaki is the last name of a famous Japanese girl.