Place 2 sheets of gelatin in cold water. Puree the strawberries in a small saucepan and heat. Once the gelatin has softened, squeeze out the excess water and add it to the strawberries. Stir, letting the mixture simmer very gently. Do not bring to a full boil.

While the strawberries cool, set out a board and place the molds on it. Fill the molds using a teaspoon. Keep a little strawberry mixture in reserve to allow for spills.

Take the container of blueberries out of the freezer and select 15 for the pupils. Place them in the center of the molds and gently push them through the strawberry mixture to the bottom.

Place the board in the refrigerator for a few hours.

Place 3.5 sheets of gelatin in cold water. Heat the coconut milk. Add the sugar (or sweetener), if using.

Once the gelatin sheets have softened, squeeze out the excess water and add them. Stir, letting the milk simmer very gently. Do not bring to a full boil.

Let cool. Take the board with the irises out of the refrigerator. Divide the milk evenly over them. Return to the refrigerator for a few hours.

Take the board out of the refrigerator. Gently pull the molds to loosen the edges of the eyeballs. Then press from underneath to pop the eyeballs out of the molds.

Depending on the temperature, the eyeballs will hold their shape for a few hours. If they get very warm, they will soften.