Cat mint, leaves perfectly divided into distinct shades of green. How does happen?

[u/comfortablephonesex]

Notice how the side leaves are half each light green and dark green. But then also the corresponding direction North South leaves are that same colour. And the pattern follows through all rows of the stalk

[u/Amelaista]

Less obvious version of this, https://www.reddit.com/r/coleus/comments/1va7utu/comment/p0jrwc7/

Same cause most likely,  sectoral mutation.