The Tenth Dot

"It was there a moment ago." Ella frowned. "What was there?" I asked. "Number Ten." Ella replied. "Ella, are you sure?" I asked. "Yes!" she insisted. "I don't see it, Ella." Marina said doubtfully. "It was there a few moments ago, the blue dot." she told us. "Maybe you thought you saw it," "Eight, I know what I saw." Ella scoffed. "It was number Ten. The real number Ten."