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 .
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 .