Define the following terms:
Imagery
Proportion
Design

Imagery: visually descriptive or figurative language, especially in a literary work.

Proportion: a part, share, or number considered in comparative relation to a whole.

Design: is a plan or specification for the construction of an object or system or for the implementation of an activity or process, or the result of that plan or specification in the form of a prototype, product or process.

Explanation:

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.