Unrelated, but I found that (uni) students find it easier to remember what conCAVE and conVex mean by recalling the shape of an entrance to a 'cave' and the sha

Unrelated, but I found that (uni) students find it easier to remember what conCAVE and conVex mean by recalling the shape of an entrance to a 'cave' and the shape of letter 'v'. Visual cues are very useful, even if you do not suffer from dyslexia.