A calligram is a visual form of writing where the arrangement of letters and words creates a specific shape or image that relates to the content of the text. This artistic technique combines poetry and visual art, allowing the text to convey meaning not just through words but also through its visual representation. Calligrams can be found in various forms of literature and art, often used by poets and artists to enhance the emotional impact of their work. Famous examples include the works of Guillaume Apollinaire, who popularized this style in the early 20th century, blending language and imagery in innovative ways.