In Describing Morphosyntax, Payne uses a number of diagrams for visually explaining aspects and what they say about actions relative to time.
Payne outlines the following, all of which occur in natural languages.
Perfective
[-----]
He wrote a letter.
Imperfective
<----->
He writes letters.
Perfect
-----|x
He has come from Aqaba.
Pluperfect
---|DC---(now)
I had entered a congested zone.
Completive
>-----|
She finished working.
Inceptive
[----->
She began working.
Continuative/progressive
>----->
He is writing letters
Punctual
x
He sneezed.
Iterative
>-x-x-x->
He is coughing.
Habitual
<----->
He drinks.
Are there other Aspects that do not appear in natural languages which have been invented for conlangs, and could they be represented with a similar visual diagram?