[beets] Where is the 'art' field coming from

[Bearcat Şándor]

When i do an info on a track, i see an art field:

beet info remedium 



/home/hometheater/audio/菅野よう子/2006-攻殻機動隊_stand_alone_complex_solid_state_society_o.s.t./01-14-remedium.wv

acoustid_id: f4efc8ff-84c5-4af7-ad14-e9fb858f65cd
               album: 攻殻機動隊 STAND ALONE COMPLEX Solid State Society O.S.T.
         albumartist: 菅野よう子
  albumartist_credit: 菅野よう子
    albumartist_sort: Kanno, Yōko
       albumdisambig: 
         albumstatus: Official
           albumtype: soundtrack
                 art: True
              artist: 菅野よう子
...



I can't seem to query on this field (it's not listed via beet fields). 
 Where does it come from (it's present in all file formats)?

Thanks

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