What Johann Sebastian Bach's composition displays all the resources of fugue writing?

Johann Sebastian Bach's "The Art of Fugue" is a comprehensive showcase of fugue writing, displaying an extensive exploration of counterpoint and thematic development. This work consists of a series of fugues and canons based on a single musical theme, demonstrating Bach's mastery in manipulating melodic lines and harmonies. Each fugue varies in complexity and structure, illustrating Bach's innovative techniques and deep understanding of the form. Overall, it serves as a monumental testament to his skill in composing intricate and engaging fugues.