This is a black and white picture that I found in another blog. The unnamed photographer took this picture from a very interesting angle. They probably took the photo from the same level of the snails by getting really close to the ground. The area in focus here is mainly the snails and a little bit of the ground. For example, the lines on the snails' shells are very distinct. The lines on the wooden floor around the snails also stand out. The rest of the image is blurry, hence the aperture might have been somewhere around 1.8 or 2. This is a great photo depicting the three snails in a line.

~Meera