How does George Bernard Shaw use imagery in Pygmalion?

The imagery (props) in Higgin's laboratory speak to his profession and hobbies. In one corner are file cabinets and a table with several instruments used for his work with speech. This includes an image of the vocal organs. A very comfortable chair and another chair flank the fireplace. A clock sits on the mantelpiece and a phonograph table with two chairs is nearby. A grand piano with its bench graces another part of this room but remnants of a previous meal sit on its keyboard.