If you're thinking about the illegality and vandalism:
* Legal art: This could include murals commissioned by the city or property owner, street art festivals, or even simply creating art on your own property.
* Restoration: This refers to the act of cleaning up or repairing surfaces that have been vandalized.
If you're thinking about the style and aesthetics:
* Traditional art: This could refer to art forms like painting, sculpture, or drawing that are typically done in more formal settings and with more conventional techniques.
* Minimalism: This is a style of art that emphasizes simplicity and reduction, the opposite of the often-elaborate nature of graffiti.
If you're thinking about the message and intent:
* Positive messaging: This would involve using art to spread messages of hope, unity, or social change, rather than the often-subversive or rebellious messages associated with graffiti.
Ultimately, the "opposite" of graffiti is a matter of interpretation and depends on the specific aspect you are interested in.