Elements: Thunder over Earth.
Image: Thunder resounds out of the Earth. Image of Enthusiasm. The Ancient kings made music to honor the merit, and offered it with splendor to the Supreme Deity, welcoming their ancestors to be present.
Judgement: Enthusiasm. It suggests finding helpers and setting armies marching.
Interpretation: Yu relates to raising the energy, being it your or the energy of those around you. Just like thunderstorm does, Yu suggests that our environment and existence can be suddenly changed through celebration. Impose your leadership to inspire those around you. Shared enthusiasm has a great power. It helps increasing a confidence that will help withstanding future problems.