It is associated with joy, sunshine, and tropics.  Orange represents enthusiasm, fascination, happiness, creativity, determination, attraction, success, encouragement, and stimulation.  To the human eyes, orange is seen as a very hot color, so it gives the sensation of heat.
West Virginia, Ohio, Illinois, and Indiana form the northern border  of Kentucky, along the Ohio River.
Ohio-Kentucky Boundary Information. The boundary between Ohio and Kentucky is within the Ohio River and was determined by a U.S. Supreme Court Decree in 1985 as the 1792 low water mark. Proximity of this boundary to the shore varies along the river.