spectator: a close observer; someone who looks at something (such as an exhibition of some kind)
perceiver: a person who becomes aware (of things or events) through the senses
ludi saeculares: the centennial rites and games of ancient Rome that marked the commencement of a new generation (100 years representing the longest life in a generation); observances may have begun as early as the 5th century BC and lasted well into the Christian era