so the first thing that pops into my head when I saw this was "wow that is a very purple door". the second thing was "it would be easy to give someone directions to your house. you would just be like its the purple door house.
Alabaster work set in porcelain tiling at Golestan Palace in Tehran, Iran. Looking closer at the threshold steps, that's not rust or wear causing the striping pattern but more polished alabaster or marble stones. Very beautiful!