Photos of Roa in Phnom Penh & Pek/Cambodia.
3 more billboards from OX in Paris and Köln.
DotDotDot bankvault in Norway + Rubin in the artic circle + Seikon from Poland in Palermo + Peter Fuss billboard + Colorful pieces from SY in St Petersburg.
A bit late but here is a selection of very good & interesting photos posted last fall on ekosystem.org. Photo of the TGV by OKS crew.