Answer:
What the author most likely means by "memory is an abstract painting is that We remember events in vague and indistinct ways.
Step-by-step explanation:
Some of the characteristics of abstract art are that it does not show reality as it is, instead it presents changed perception of reality through the use of colors and shapes, then the expression makes a comparison where a person's memories have quite the same characteristics since they project reality in a different form from person to person, and normally not as it really was.