This is a visual representation of the field recording I made on the streets of Barcelona while dragging my luggage-bag-as-stylus across them.
Sound diary: The Barcelona streets were made of ornate and patterned tiles, the most beautiful pavement material I have seen so far. In contrast with the huge concrete slabs of Detroit for example, this was like some Romantic masterpiece with aging Catalan Gothic / Medieval buildings, a vibrant street life, muted oranges, reds, yellows all around; while the grooves in the thousands of tiles I ran over gave out an incessant, vibrant street rhythm.