Prompt
Create an image of John Ambrose Fleming, a middle-aged British engineer and physicist from the late 19th and early 20th centuries, sitting in a study with a vacuum tube (thermionic valve) and other electrical components on the desk in front of him, wearing a suit and holding a notebook and pen, with a subtle background suggesting his association with University College London and the Royal College of Science; the style should be a realistic portrait with a formal and professional tone.
