Napolean instrusted the animals to fill the nearby empty grain bins with sand and then place the meager supply of grain and meal on top of it. What is the significance of this action as it applies to the humans and to the farm animals?

Because of increasing food shortages, the animals begin to go hungry. Knowing that the humans must not hear of Animal Farm’s hardships, Napoleonenlists the sheep to comment about their increasing rations when within earshot of Mr. Whymper. He also has someone lead Mr. Whymper past the food bins, which are filled with sand and topped with grain to look full.