A skytree is an image looking up from the base of a tree. Revealing both the tree and the sky it give a sense of place with a more or less vertical view that is naturally quite different from that of the horizontal view that typically defines place.
Here are several examples from a recent trip to Provence using the vantage point of olive trees.
The first one is from Avignon.
The second is also from Avignon. The stone tower seen in the lower portion of the image is the upper portion of one of the towers that punctuate the walls surrounding the old town.
This third is from Nimes. My shirt was getting caught in the branches as I bent down to take the shot, which caused the leaves to blur and allowed me to capture something of the mood of the park toward sunset that evening. The stones glimpsed here are those of a Roman tower.