This will be used to project the Bat Signal. 6. Attach the Stencil: Glue the Bat Signal stencil to the top of the smaller bottle cap, ensuring it is aligned with the LED light. 7.

The glow of the bat signal will illuminate 11 cities across the world on Saturday – Batman Day – on the caped crusader’s 80th anniversary.

Several cities across the world are lighting up the Bat-Signal on Saturday. In celebration of 80 years of Batman, DC Comics is asking you to look to the skies -- or buildings -- to get a glimpse ...