External symmetries

External symmetries refer to patterns or invariances observed in a system when viewed from outside. Think of an object or structure that looks the same from different angles or positions—like a perfectly round ball or a symmetric building. In physics, external symmetries relate to how the laws of nature remain unchanged when we change our perspective or move position in space and time. These symmetries help us understand fundamental principles, such as conservation laws, and reveal deep relationships between the universe's structure and the laws that govern it.