By controlling which pipe received light at any one time they were were able to make text and numbers glow through the sides of the bases of specially constructed chess pieces.
Authorities recovered Christmas-tree lights in one of the suspects' rooms, prompting investigators to see whether part of the initiator for the pipe bombs was light-bulb filaments, the FBI report said.
Just today, because I walked with the urban wildlife expert John Hadidian, I noticed that a pipe affixing a traffic light to its pole was hosting a slew of nesting sparrows.