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.
[-----] He wrote a letter.
<-----> He writes letters.
-----|x He has come from Aqaba.
---|DC---(now) I had entered a congested zone.
>-----| She finished working.
[-----> She began working.
>-----> He is writing letters
x He sneezed.
>-x-x-x-> He is coughing.
<-----> 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?