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Differences between circles are, in the nature of things, slight – variation in the degree to which they become architecture.
The circle has a lengthy typological background in Irish architecture moving from culture to culture, slipping from function to function, inherited and re-invented over time, still today dominating the plan metric landscape of rural areas.
The Celtic enclosure has been used to great effect, semi-circle has been used and open to the south facing sun to catch and hold the natural solar gain and energy of the sun.