A tall narrow watercolor of a single tree — and one of the most carefully observed botanical studies Sidney made. The tree occupies the lower half of the composition: a twisted, multi-branched form in vivid green, its trunk rendered with genuine attention to the gnarled, branching character of an old tree, its upper branches dissolving into a lacy network of fine marks against the luminous sky.
The sky above is the painting's technical triumph: a large, loose, wet watercolor field of pink, blue, yellow, and orange that reads as late afternoon light, the colors separated and bleeding together in the natural manner of wet-into-wet technique. No two areas are the same — the orange at upper right has a different character from the pink at upper left, the blue at center has a different granularity from the yellow-green at the horizon. This sky is painted with the freedom of full technical confidence, the hand moving quickly while the paper is wet.
Against this loose sky, the tree is painted with contrasting deliberateness — each branch decision made specifically, the fine terminal branchlets rendered with a small brush held lightly. The tension between the free sky and the specific tree is the compositional engine of the work.
The format — tall and narrow, almost scroll-like — frames the tree as if it is the subject of a formal portrait. Not a tree in a landscape but this tree, examined. The green is particularly vivid: a yellow-green that reads almost as light, as if the tree is lit from within.