Our universe is in a constant state of flux. Everything within it undergoes transformation, whether through sudden, violent shifts or gradual transitions. When an object's composition changes—whether its parts are replaced or its form is altered—it may still seem familiar, yet it is undeniably different. As these differences accumulate, there comes a point where the object becomes unrecognizable. But before that threshold, can we still call it the same object?
Consider an old ship, meticulously maintained over decades. Over time, every plank of wood is replaced, the sails swapped out, the equipment renewed, and even the crew eventually changes. Though the ship may look as it did in the past, flying the same flag and bearing the same name, is it truly the same ship? This idea might be easy to grasp with a boat, but what does it mean when applied to a conscious being like yourself? Every atom in your body has been replaced multiple times throughout your life, yet your memories, consciousness, and personal narrative remain intact. What does this mean for your sense of self? Matter flows through our universe, temporarily taking forms we recognize before moving on.