The "23 Envelope" is a design concept created by the artist and designer David Carson in the 1990s. It is known for its unique approach to typography and layout, often featuring bold colors and unconventional arrangements. The design aims to challenge traditional graphic design norms, making it visually striking and memorable. This concept gained popularity in the world of graphic design and advertising, influencing many designers to experiment with their styles. The "23 Envelope" represents a shift towards more expressive and artistic forms of communication, emphasizing the importance of creativity in visual storytelling.