W. Bernard Carlson, Tesla: Inventor of the Electrical Age

"TESLA’S CAT[Nikola Tesla’s favorite childhood companion] was the family’s black cat, Macak. Macak followed young Nikola everywhere, and they spent many happy hours rolling on the grass. It was Macak the cat who introduced Tesla to electricity on a dry winter evening. “As I stroked Macak’s back,” he recalled, “I saw a miracle that made me speechless with amazement. Macak’s back was a sheet of light and my hand produced a shower of sparks loud enough to be heard all over the house.” Curious, he asked his father what caused the sparks. Puzzled at first, [his father] finally answered, “Well, this is nothing but electricity, the same thing you see through the trees in a storm.” His father’s answer, equating the sparks with lightning, fascinated the young boy. As Tesla continued to stroke Macak, he began to wonder, “Is nature a gigantic cat? If so, who strokes its back? It can only be God,” he concluded."