Early morning light imbues the Oval Office with a soft glow as President Ronald Reagan walks among its greenery and historic artifacts one last time as leader of the American people. The man who left the presidency with the highest approval rating in history turned over the reins of government - as well as his spacious, sunny office - Friday to President-elect George Bush. And the Oval Office, which has changed hands 41 times now, is ready to begin the circle again.