The phrases which most appeal to the sense of sight in Hayden's poem are: 'poisons the air like fallout' and 'the serene, great picture'. At the beggining of the poem, the author states a comparision by saying 'Today as the news from Selma and Saigon poisons the air like fallout...'. Through this comparision, you can picture in your mind how bad the news were. Besides, the use of the phrase 'the serene, great picture that I love' makes you think of something nice and pleasant appealing once more to your sense of sight.