Okay, so tentatively the year will be:
Summer days 1-92,
Autumn days 93-183,
Winter days 184-274,
Spring days 275-365
One of the seasons has to get an extra day...I think it should be summer.
As for the different artistic styles, I think of many of the 'developments' in US cities - an area will have similar type architecture, and then the next neighborhood over, which is 20 years olders looks different, but is internally matching in style for it's neighborhood.