Difference between graffiti and mural

I would like to properly document the use of artwork_type=graffiti, a previously undocumented but widely used tag, to clarify the difference (if any) between a graffiti and a mural (artwork_type=mural).

These are the definitions included on the Key:artwork_type page:

A mural is any piece of graphic artwork that is painted or applied directly to a wall, ceiling or other permanent substrate.

A notable graffiti work

The Polish version of the wiki provides additional details:

Graffiti. Od muralu różni się tym, że jest malowane sprayem lub sprayem przez szablon i tworzone najczęściej anonimowo, bez zez zezwolenia.

Machine translation:

Graffiti. It differs from a mural in that it is painted with spray paint or a stencil and is mostly created anonymously, without permission.

Mural techniques include fresco, mosaic, graffiti and marouflage (see Mural on Wikipedia), so then it might be conflict to establish the difference in that the graffiti uses spray paint. Nor does size seem to make a difference, as there are large-scale graffiti murals. In addition, some graffiti are created by artists whose name is known.

Mural/Graffiti by Lalo Luque (Lalone) on a building. Source: own work (CC BY-SA 4.0) available on Wikimedia Commons.

Any suggestions for properly documenting the use of artwork_type=graffiti on the wiki and explaining the difference with a mural? Any comments would be appreciated.

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/difference-between-graffiti-and-mural/98056