At the beginning of the play he shows them strongly as a dramatic device, in that he uses them to show how the Birling family are cold-hearted, distant people and how money and wealth has destroyed them as a family. He shows how the family are very well off, by saying "dessert plates" and "champagne glasses" as well as other expensive items. However, there is also distance between the family members as he writes that "men are in tails and white ties" and that it is "not cosy and homelike". He also describes the characters between Mr and Mrs Birling by sitting them at opposite ends of the table.Priestley also uses the lighting first used and described as "pink and intimate" showing a 'warm' and 'joyful' atmosphere. However the audience understands that it is just a screen covering up secrets and that they are in fact looking through 'rose-tinted glasses' and that it is not really what it seems. This is confirmed when the Inspector appears and the lighting changes to a "brighter and harder light" where it gives the impression of guiltiness and the truth when atmosphere from joy from engagement to worried conscious in what happened .The character of the Inspector has also been used as a dramatic device. He makes it seem as if socialism is the true and honest way to live. The Inspector uses imagery in order to shock the Birlings into giving him information, "she'd swallowed a lot of strong disinfectant. Burnt her inside out of course". In this speech he shows that for lower class, "Eva Smiths and John Smiths" there is a "chance of happiness" in socialism. The Inspector also makes the audience realise that they are "members of one body" and that they should try their best to help people like Eva Smith, otherwise, as the Inspector shows, "they will be taught in fire and blood and anguish".