Prepare the Colored Cubes: Pour one cup of your first fruit juice into a small saucepan. Sprinkle one teaspoon of agar agar powder over the cold liquid. Let it sit for two minutes to bloom. Place the pan over medium heat and bring to a simmer, stirring constantly. Boil for exactly one minute to activate the setting properties. Pour the mixture into a square glass container. Repeat this process for each color you have chosen. Place the containers in the refrigerator for at least one hour until completely firm.

Dice the Mosaic Pieces: Once the colored gels have set firmly, remove them from the fridge. Use a sharp knife to slice the gelatin into small, uniform cubes. Mix the colors in a bowl gently to see the rainbow come to life.

Prepare the Creamy Base: In a clean saucepan, combine coconut milk, filtered water, agave nectar, and vanilla bean paste. Sprinkle the remaining teaspoon of agar agar powder over the top. Let it bloom for two minutes. Bring the mixture to a gentle boil while whisking steadily. Once it reaches a boil, lower the heat and simmer for two minutes. Remove from heat and let it cool slightly.

Assemble the Masterpiece: Lightly grease your large mold with neutral oil. Distribute the colored cubes evenly throughout the mold. Gently pour the warm creamy base over the cubes, ensuring no air bubbles remain.

Final Set and Unmolding: Place the mold in the refrigerator for at least four hours. To unmold, gently pull the edges of the gelatin away from the sides and invert it onto a plate.