The only proper work I’ve done this last 10 days or so – aside from struggling with this blog ( trying to post 3 different galleries ! ) & keeping up with stuff online generally . The interesting difference with horse chestnut compared to the previous oak drawing is that here the background is dark from the branches . This is the case even in brilliant sunlight when the greens are quite vivid , because the sun’s rays come in slantwise through the umbrella-like layers . Oak trees have quite a different sort of habit carrying their dagged leaves far away from the thicker boughs and branches so that they make lacy patterns against the sky .