Final answer:
The sense associated with a snowflake traveling is the sense of sight, since it involves visually observing falling snowflakes.
Step-by-step explanation:
In line 2, the sense in the snowflake traveling would be the sense of sight, as snowflakes can be visually observed when they are falling. This is derived from the context provided, as it suggests a focus on the visual experience of seeing snow, especially in films and pictures, which is primarily a visual medium. The other senses listed, such as touch, sound, taste, and smell, are not explicitly involved in the mere action of a snowflake traveling through the air as witnessed by a viewer.