Take a look at the example below:
Here we see two melody lines that look different, but are actually very similar. Notice how the rhythm is similar, as well as the size of the intervals in the melody. Plus, there is a retainment of certain degree of pitches. This is called a mirrored reflection treatment in counterpoint.
To write something like this, pick a “point of reflection;” here, middle C was chosen because it happens to be in the middle of the grand staff. Now, any note above the “point of reflection” music be copied down, containing the same interval quality. Vice versa: any note below must be reflected above.
Be sure to be mindful of harmony, as using this process tends to bring out some dissonant intervals.
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