Final answer:
The use of technology to communicate is highlighted as a theme in Card's portrayal of Jane revealing the changes in the piggies' culture to the Hundred Worlds through the ansible.
Step-by-step explanation:
Jane reveals the changes in the piggies' culture to the Hundred Worlds through the technology of the ansible. The theme that Card reveals about the use of technology here is the power and impact of communication. The ansible allows for instant and long-distance communication, bridging the gap between different civilizations and cultures. This highlights the potential of technology to break down barriers and foster understanding.