Juan Carlos Argüello, better known as Muelle (Spanish for "dock" or "pier"), was a Spanish urban artist and a pioneer of graffiti in Spain. Born in Madrid on December 27, 1966, Muelle rose to prominence in the 1980s, during the countercultural movement known as La Movida Madrileña. Muelle's distinctive style featured a unique calligraphy, characterized by continuous and fluid lines, and often included an arrow at the end of his signature. His work was primarily seen on walls and subway trains in Madrid, and he quickly gained notoriety for his artistic talents and rebellious spirit. Although Muelle passed away at a young age in 1995, his work has left a lasting impact on the Spanish graffiti scene and the urban art community at large. His innovative style and dedication to his art have inspired generations of graffiti artists and have helped to establish graffiti as a legitimate form of artistic expression.