at Reitz Union Gallery,
1. an observable fact or event.
2 a. an object or aspect known through the senses rather than by thought or intuition
b. a temporal or spatiotemporal object of sensory experience.
c. a fact or event of scientific interest susceptible to scientific description and explanation.
3.a. a rare or significant fact or event.
b. an exceptional, unusual, or abnormal person, thing, or occurrence.
from Merriam-Webster Dictionary