First two and the last ones are oldies. First the Crystal Square, designed by Roberto Burle Marx presents plenty of lines coming and going from and to all directions (notice a nice addition of the curve in the building on the background). Second, an art installation at the open air musem/art gallery of Inhotim (left it grainy as it came out, but dessaturated). Third and fourth were taken recently and, last but lot least, the emergency stairs of a building in Rotterdam.

Good luck to all participants!