> What's actually periodical and wraps around is only the names we give to certain lengths of time Seasons are somewhat cyclic, to be fair. Centuries are prett

> What's actually periodical and wraps around is only the names we give to certain lengths of time Seasons are somewhat cyclic, to be fair. Centuries are pretty arbitrary though. > Spiral visually implies years getting bigger or shorter which they don't. Proper spirals imply a size change, but I suspect GP meant the shape more properly called "helix".