Graffiti is the unauthorized marking of public spaces with paint or other materials, often done as a form of artistic expression.

Sculpture is not a common technique used in street art, as it is typically more permanent and requires more resources and materials.

Keith Haring is considered to be one of the pioneers of modern street art, known for his simple and iconic figures and lines.

A mural is a large-scale painting applied to a wall or other surface, often used to convey a message or tell a story.

Abstract art is not a common theme or subject matter found in street art, as it is typically more focused on conveying a message or telling a story.

A stencil is a piece of street art that is created using stencils, which are cut-out shapes or designs that are used to spray paint or apply other materials to a surface.

Sculpture is not a common type of street art installation, as it is typically more permanent and requires more resources and materials.

A paste-up is a piece of street art that is created using wheatpaste or other adhesives to attach posters, prints, or other materials to a surface.

Vandalizing property is not a common reason why people create street art, as it is typically seen as a form of artistic expression and communication.

An assemblage is a piece of street art that is created using found objects or materials, often combined together to create a new and unique artwork.

Etching is not a common technique used in graffiti, as it is typically more permanent and requires more specialized tools and materials.

Projection mapping is a piece of street art that is created using light projections, often used to create interactive or dynamic displays.

Competitions are not a common type of street art event, as street art is typically seen as a form of artistic expression rather than a competitive activity.

Interactive art is a piece of street art that is created using interactive technology, allowing viewers to engage with the artwork in a physical or digital way.

Sculptures are not a common type of street art installation, as they are typically more permanent and require more resources and materials.