The page illustrating Matthew Writing His Gospel from the Lindisfarne Gospel Book (Fig. 15-17) demonstrates . the artist intentionally suppressed classical style to emphasize local artistic tradition the artist wanted to emphasize strong connections to Rome the artist was not aware of the use of modeling and illusionistic techniques in painting the artist completed two similar versions of the same scene

answer; statuesque figures that cast shadows);

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it seems to me that yes they solo on the chord changes.  coltrane for sure solos on the chord changes. instead of changing scales, they use a different method over the chord changes. this melody is very  unique but may often times even be considered simple, which is quite common in this modal  type. for example, there are changes from the key of minor to major in this piece, which makes it  unique in its own way.