Creating a sense of proportion in oversized porcelain sculptures is both a technical challenge and an artistic pursuit. The sheer scale of these pieces demands careful planning to avoid visual imbalance. Here are the most effective techniques to achieve harmony in large-scale ceramic art:

1. Modular Design: Break the sculpture into smaller, interconnected sections. This allows for better control over proportions and simplifies the firing process.

2. Visual Anchors: Incorporate focal points that guide the viewer's eye, such as textured surfaces or contrasting elements, to create a natural flow.

3. Negative Space: Use empty spaces strategically to balance the sculpture's mass, preventing it from appearing overly dense or top-heavy.

4. Mathematical Ratios: Apply golden ratio or Fibonacci sequence principles to ensure pleasing proportions, even at monumental scales.

5. Progressive Scaling: Gradually increase or decrease elements to maintain coherence, ensuring smaller details don't get lost in the overall composition.

6. Material Considerations: Account for clay shrinkage during firing by pre-calculating size adjustments, typically 10-15% depending on the clay body.

7. Viewing Angles: Design with multiple perspectives in mind, as oversized pieces are often viewed from various distances and heights.

The key lies in maintaining a dialogue between the sculpture's physical presence and its visual impact. Many artists create detailed maquettes (small-scale models) to test proportions before committing to the full-size piece. Contemporary sculptors often combine traditional ceramic techniques with digital tools like 3D modeling to perfect proportions before construction begins.

Remember, proportion in oversized works isn't about strict symmetry, but rather about creating a harmonious relationship between all elements that feels instinctively right to the viewer. The most successful large porcelain sculptures achieve a gravity-defying elegance precisely because their proportions have been meticulously calculated to create this illusion of effortless balance.