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.
Sasaki is the last name of a famous Japanese girl.