The observer effect is a common principle in quantum mechanics. Basically, it states that the mere observance of an object changes the actual object. You can read more about it, including Schrodinger’s famous cat, HERE.
The Stoics advocate behaving as if someone is always watching you. Someone you admire and respect. Seneca called it having a “sage on your shoulder” at all times.
So, if you knew you were being observed and that the observance changed you, what would you do differently? What actions would you take or not take? What habits? What art might you create?
Let the observer effect inform what we think, say and do.