Harry was walked over to a lab table that had a faucet and sink built into the top, and had a framed, frozen photograph of Professor Hollingsworth by the desk’s one chair. Hollingsworth showed Harry how to work the three runes in the photograph-frame: Putting the tip of his wand to the green rune cast an area of silence round Harry and his lab table, and "woke up" the photo; putting his wand-tip to the yellow rune dropped the area-silencing and made the photograph stop talking, when Harry wanted to speak with the real Professor Hollingsworth; and the red rune ended the area-silencing and returned photograph-Hollingsworth to his beginning-of-lesson face. The red rune accepted Professor Hollingsworth’s wand anytime during the lesson, but the red rune would accept Harry’s wand only after photograph-Hollingsworth said, "This completes today’s lesson."