The noun capital can hold different meanings, and as always it is subjective what to choose to express a theme in a photo.
I like birch trees. I love the fine detailing from the stem, to branch to the twigs. From big to delicate. A birch can be intimidating, towering over me.
Looking up a birch gives me a feeling of humility. This photo is from 1979, a time when i was printing in a darkroom on paper. And loved big abstracts in monochrome.
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About the B4 retouch series:
I browsed my archive for pictures to publish. Some of them are partly retouched but most do have scratches, dust and stains.