These two strange artworks were found on walls near my office. The second one I've walked past so many times I don't even give it much thought, it was only when I found another similar a few streets away that I began to wonder.
A few quick internet searches gave me the answer. A street artist known as Invader who has many of these little mosaics across the globe. According to the website there are currently 101 in London - a few still to find then!