1, with different meanings: graffiti wall means "scribbling" in Italian, and plural graffiti refers to scribbling images or paintings on the wall; The signature wall is on the wall of an empty room next to the defense room. Students who take part in the defense will leave their signatures on the wall at will.

2. Different development: graffiti walls have spread to many countries in the world after decades of development; The signature wall began when the university was founded.

3. Different in nature: graffiti wall is an anti-cultural social behavior, which is more acceptable to people after adding art; The signature wall is a unique landscape.