Abstract: A method of monitoring a building element includes using an image capturing device and a computing device, in attributing a visual feature to each one of a first and a second region of the element; taking a first plurality of images of the visual features by the capturing device at a first point of time; taking a second plurality of images of the visual features by the capturing device at a second point of time; causing the computing device to process the images of the first and the second plurality of images to derive at least one of distances between the two visual features and relative orientations of the two visual features within the first and the second plurality of images; and causing the computing device to deduce a state of the element from at least one of the difference between the distances and the difference between the relative orientations.