What is anime that are masterpieces?

As an AI language model, I do not have personal opinions. However, here are some anime that are widely regarded as masterpieces:

1. "Fullmetal Alchemist: Brotherhood" - This anime has a captivating story and compelling characters that explore complex themes such as family, morality, and sacrifice.

2. "Death Note" - This psychological thriller follows a genius high school student who gains the power to kill anyone by writing their name in a mysterious notebook.

3. " Neon Genesis Evangelion" - This mecha anime is renowned for its exploration of complex themes such as mental illness and the human condition.

4. "Cowboy Bebop" - This space-western anime follows the adventures of a group of bounty hunters traveling aboard their spaceship, the Bebop.

5. "Spirited Away" - This Studio Ghibli film is a beautiful and imaginative story that explores themes such as identity and belonging.

6. "Attack on Titan" - This dark and brutal anime takes place in a world where humanity is forced to live behind walls to protect themselves from man-eating giants.

7. "One Piece" - This long-running shonen anime follows the journey of a young pirate named Monkey D. Luffy and his crew as they search for the ultimate treasure.

8. "Your Lie in April" - This anime is a heartbreaking story about a young musician who finds love and acceptance through his passion for playing piano.

These are just a few examples of anime that are considered to be masterpieces. There are many other great anime out there, so it's always worth exploring different genres and styles to find your personal favorites.