-Thalys wanted to highlight how each city has its own sounds, creating a uniqueness that cannot be found anywhere else. That’s how they ended up with 1460 sounds for Paris, 1352 for Amsterdam and 1889 for Brussels. It has been observed that a single interactive billboard, without any visual content, is more than enough to grab the attention of passengers, creating an urge to travel and explore other cities as they wouldn’t imagine. Each sound is associated with different feelings and that’s how these billboards turned into a success from the very first day.