Each week, we publish a gallery of readers' pictures on a set theme. This week it is "opposites".
Elaine Farrell: "Photo taken in a tunnel in Amsterdam. One side is for pedestrians, the other for cyclists. The pedestrian side is tiled and throws off amazing light, while the opposite is dark and industrial in look. The dark arc of tile on the right really adds to the symmetrical feel of the photo."
Simin Zeng photographed a dog who had spotted a supersize version of himself while his owner seems unfazed.
Nicola Taggart: "Some Siskin birds were eating from a bird feeder in the New Forest. The two in the picture amused me."
Stephen Farrand: "This photograph was taken on the main island, Santa Cruz, of the Galapagos archipelago. The island is surprisingly developed, but the giant tortoises seem to take it in their slow stride."
Elisa Decker: "A young woman sketches Houdon's Winter at the Metropolitan Museum of Art, New York City."