There are such things as classic themes in LEGO builds, like Castle or Space, but there are also very well-established motifs that can fit into these broader themes. One such motif that is often visited by many builders over what is now decades is floating rocks. Marcel V. takes inspiration from some of the more famous floating rock builds to bring us this cute little floating watchtower.
The best part is the watchtower, in my opinion. It has a unique polygonal shape with a cute little dock and very good colour work. Notice that the door is actually a window piece wedged in front of the wall. There are a few other examples of unconnected bricks used on it as well, a technique people seem to either love or hate, but in this case it works really well — connecting the piece just for the sake of it would not change the look of the creation anyway. Besides the watchtower itself, the little landscape adds just enough colour to set the mood and give the titular tower a nice contrast.