This rug changes colour when you switch it around.  I couldn't decide on dark grey or light grey and now I don't have to decide.  I constantly switch it around depending on my mood.  I'm also buying the larger one to fit in this hallway, (the pictured rug is for a smaller area, I just wanted to see what it would look like in this hallway before committing to another purchase).  I am very happy with my purchase.