There are numerous and varied explanations where the custom of kissing underneath it came from on the internet. It has certainly long been a symbol of peace and also fertility, but if it's difficult to be absolutely sure when the custom started, its not hard to understand why its still going strong!
Its delicate structural form casts wonderful shadows. The berries not white at all but the palest green/grey, vibrant yellow buds blending down into the stems and leaves.
...from my seasonal colour sample notebook.