The birthday is existence celebrated — the annual day when being here is the achievement. The forgotten dream-birthday is the ache of unmarked existence; the party thrown is being valued made visible; the cake's candles count the story so far.
Positive Resonance
Existence marked and celebrated, being valued visibly, the year honored
Shadow Aspect
The forgotten birthday, celebration performed dutifully, aging's annual notice
Nuances
Everyone forgot: existence feeling unmarked
The surprise party: being valued beyond expectation
Blowing out candles: the wish at the year's mark
Your own party, feeling absent: celebrated but unseen