[cornelis]

False dichotomy. There are infinitely other possibilities

Either we retain an identity or blink off into oblivion.

In retaining an identity we are necessarily a part of something that transcends the periodicity of material change. And whatever transcends this, is either personal or impersonal. Infinite possibilities may exist for a plurality of identities, but there are some basic dichotomies in play for us.

[aNYCguy]

In retaining an identity we are necessarily a part of something that transcends the periodicity of material change.

Periodicity means recurrance at equal time intervals. I'm not sure what you means by "the periodicity of material change."