Mark is a young man with synesthesia. It is not a ＿＿（36）＿＿ (although it sounds like one), and it does not really have any serious effects on his day-to-day life. However, it is a strange condition. Synesthesia happens when two or more of a person's senses get 37 . For example, Mark "tastes" words. His sense of taste 38 when he hears or reads certain words, even if he is not eating anything. For him, the word "box" tastes of eggs. His sister is synesthetic, too, and she sees words 39 color. Hence, when she sees the word "Tuesday" or just thinks of the word "Tuesday," she gets the feeling of "brown." Actually, the kind of synesthesia, where the days of the week are colored, is the most common type. Some scholars suggest that synesthesia is 40 to the way our brains develop language and that there is a link between sounds and shapes.