Rembrandt Harmenszoon van Rijn is celebrated as one of the greatest painters and printmakers in history, particularly renowned for his masterful use of light and shadow, his psychological depth in portraiture, and his innovative approach to etching. His works, especially those from the Dutch Golden Age, are highly valued for their realistic depiction of human figures and emotions, making him a significant figure in art history. 

Here's a more detailed look at why Rembrandt is so famous:

1. Mastery of Light and Shadow (Chiaroscuro): Rembrandt's signature style involved a dramatic use of light and shadow, known as chiaroscuro, to create a sense of depth and drama in his paintings. This technique, combined with his expressive brushwork, brought a unique intensity and emotional impact to his artworks. 

2. Psychological Depth in Portraits: Rembrandt excelled at capturing not just the physical likeness of his subjects, but also their inner emotions and personalities. His portraits reveal a deep understanding of human nature, showcasing both the strengths and vulnerabilities of his contemporaries. 

3. Innovative Printmaking: Rembrandt transformed etching from a reproductive technique into a true art form. His etchings, like his paintings, are celebrated for their technical skill, expressive power, and ability to convey a wide range of emotions and narratives. He produced around 350 etchings, many of which were radically revised between different states. 

4. Iconic Paintings: Rembrandt's most famous works, such as "The Night Watch" and numerous self-portraits, are instantly recognizable and have become symbols of the Dutch Golden Age. "The Night Watch," in particular, is renowned for its dynamic composition, dramatic lighting, and the way it captures a sense of movement and action. 

5. Influence on Later Artists: Rembrandt's influence on subsequent generations of artists, including those in the 18th and 19th centuries, is undeniable. His techniques and artistic vision inspired countless painters, printmakers, and even contemporary artists. 

6. Unique Visual Biography: Rembrandt's extensive series of self-portraits, created over several decades, offers a unique visual record of his physical and emotional development throughout his life. This provides valuable insight into his artistic journey and personal experiences. 

7. Beyond the Portrait: While renowned for his portraits, Rembrandt also explored a wide range of subjects, including biblical scenes, mythological themes, landscapes, and genre scenes. This versatility contributed to his enduring fame and recognition.