To create a Minecraft glowing rhombus in the sky, you'll need to leverage the game's mechanics for light sources and potentially custom resource packs for unique visual effects. Here's a detailed approach:

1. Structure Design:

• Shape Creation: A rhombus is essentially a tilted square. You'll need to build a framework using a material that won't obstruct the light, such as glass panes or invisible blocks (if using a mod that allows for them). The size of the rhombus will determine the scale of your project. Consider starting with a smaller prototype to refine the design before building a large-scale version. The framework should be hollow.

• Frame Material: Glass panes are ideal for allowing light to shine through. If you want a more solid appearance, use stained glass panes for color variation. For a truly ethereal look, consider using a custom resource pack to replace the glass with a more luminous texture.

• Tilt and Orientation: The rhombus needs to be tilted. This can be achieved by carefully placing blocks at angles. Consider using scaffolding or other temporary blocks to help maintain the correct angles during construction. You'll need to calculate the angles precisely to ensure a symmetrical rhombus.

• Height and Placement: The height will determine how prominent the rhombus is in the sky. Consider the surrounding landscape and the overall aesthetic you're aiming for. Place the rhombus high enough to be clearly visible but not so high that it's difficult to build or maintain.

2. Illumination:

• Light Sources: The most crucial aspect is the light source. Use glowstone, sea lanterns, or end rods within the framework. The placement of these light sources will determine the intensity and evenness of the glow. Experiment with different light source combinations to achieve the desired effect. For a more intense glow, consider using multiple layers of light sources within the structure.

• Light Color: If you want a specific color, use colored glass panes in conjunction with the light sources. The color of the glass will tint the light emanating from within.

• Custom Resource Packs: Consider using a custom resource pack to enhance the glow. Some resource packs offer brighter or more visually striking light sources. This can significantly improve the overall aesthetic of your glowing rhombus.

3. Construction Techniques:

• Scaffolding: Use scaffolding or other temporary blocks to help with construction, especially at higher altitudes. This will prevent accidental falls and make the building process safer and more efficient.

• World Edit (Optional): If you're comfortable using World Edit (a mod), it can significantly speed up the construction process, allowing for precise placement and manipulation of blocks.

• Iterative Design: Start with a smaller version to test your design and refine the lighting before committing to a larger-scale project.

4. Advanced Considerations:

• Animation (Advanced): For a truly spectacular effect, consider using redstone circuitry to create a pulsating or rotating glow. This requires advanced redstone knowledge.

• Particle Effects (Advanced): Some mods allow for custom particle effects. You could potentially add shimmering particles around the rhombus to enhance its ethereal quality.

• Environmental Integration: Consider how the rhombus interacts with the surrounding environment. Will it be a standalone structure, or will it be integrated into a larger build?

Remember to save your progress frequently, especially when working at high altitudes. This detailed approach allows for a highly customizable and visually impressive Minecraft glowing rhombus in the sky.