Hamiltonian flow over deformations of ordinary double points

We cannot see Mt={(z1,…,zn):∑i=1n|zi|2=1,z12+⋯+zn2=t} fromM={(z1,…,zn):∑i=1n|zi|2=1,z12+⋯+zn2=0}, from the point of view of the Hamiltonian mechanics, even though their CR structures are so different. Nevertheless, in this paper, by using a special kind of the Hamiltonian flow, we write down the Kodaira–Spencer class of this deformation, MtMt is an element of primitive forms.