Guernica was the painting that first taught me to appreciate abstract art. Up until then, I had disregarded it as infantile and ugly. This was the painting the taught me that realism isn't always the best way to convey meaning and emotion. It was a stunning and mind-altering realization.
Much like how Williams' poem, “The Red Wheelbarrow”[1] introduced me the evocative power of poetry.
[1]http://www.poetryfoundation.org/archive/poem.html?id=174770