premise: To celebrate Bastille Day (14 July) or the 1944 Liberation (25August), blue, white, and red laser beams are bounced off the Eiffel Tower, Arc de Triomphe, and H??tel de Ville.
hypothesis: Celebratory blue, white, and red laser beams reflect off famous landmarks such as the Eiffel Tower, Arc de Triomphe, and Hotel de Ville to commemorate both Bastille Day and 1944 Liberation Day.