Time

How may we define This concept, so surreal? Yet it exists, we are sure, Through change we all feel. Many phrases are common, That would seek to clarify. Such as, 'make it', 'have it', Or when having fun, it'll fly. Even Einstein's equations, Adding those dimensions of space... Carefully crafted, complex, Not easy for the commonplace. But the one thing for sure, Is that it definitely marches on. From the moment of our birth, Our lives, and well after we are gone.