We do this with our winter unit. We then let them glue a cotton ball. The cotton ball represents the polar bear. We begin by reading the book through several times so that students can develop a feel for the rhythm of language. The student whose eyes are covered responds by guessing who has spoken to him.
Teachers keep a record of who is in the chair and who is speaking.
It works perfectly if the person who speaks takes the next turn being in the chair. Enough space for a portrait is left in the middle of the page. We were doing a study of animals. I created a polar bear shaped book. In this book the students had to put the correct sound for animals you find in winter, in Canada.