Viewing the pictures from my cycling vacation I was somewhat perplexed when I saw the one shown on the right. The other pictures taken can readily be "semantically" annotated (landscapes, buildings, beautiful baroque decorations), this one cannot. To properly annotate this picture one must first understand what is being depicted (which is not that trivial). This is not sufficient, the picture illustrates knowledge about a natural phenomenon and that is why I took it. A clue: the picture was taken in Paderborn. (Click for a high-resolution version, not sure it will help).
The image on the left is of an entirely different nature. It is a first attempt to compress a weblog into a single image. The motivation is to get a (visual) grip on topics used in a weblog. Each cell represents a term, adjacent cells represent related terms (based on co-occurrence) and the colour represents the strength of the relatedness of the neighbouring cells (red is hot, blue is cold). Interpreting the image is a little difficult by looking at it (as with the picture above), and for the time being I'm just using it as a tool for validating topic detection in tOKo. This particular one is of my own weblog, the mouse-over on the red area in the top left tells me that I blog about cyclist and the terms that surround it are: city, map, gps, legend, bike, train, distance and picture. Ideally, for any given blog there are several hot areas that point to a topic. If this is indeed the case, the constructed images can be used for navigation by finding the posts related to the topic. This would also close the relation between finding interesting places to visit in the real world and finding interesting posts to read in the blogosphere :-).