The “Day of the Dead” is looming, with all the macabre symbolism of the season. I usually enjoy my daily walk through my residential neighborhood, but in the past few days the scene has changed as giant spiderwebs and partially buried skeletons appear on manicured lawns. Leering skulls with lighted eye sockets peer from simulated graveyards, and a variety of monsters in various stages of decay, some with creepy sound effects, set the tone for the October 31 celebration of “Hallowe’en.”