We now extend our mental exercise to the plant's whole organism. By a similar mental effort as applied to the leaf-formations we strive to build up a complete plant. We start with the seed, from which we first imagine the cotyledons unfolding, letting this be followed by the gradual development of the entire green part of the plant, its stem and leaves, until the final leaves change into the sepals of the calyx. These again we turn into the petals of the flower, until via pistil and stamens the fruit and seed are formed.