This is a Motte and Bailey.

And I intend to make one, with aid from my fine Finnish fisherman friend, InnocentFarmer.
Day 1
Initially, I needed to flatten the border of the ditch so that it would be of (roughly) equal depth.
And here, the motte begins to take formation, starting as a simple mound of dirt. InnocentFarmer is in the background, cooking fish.
Whilst digging I find a lot of worms. Worms are used for fish bait, and fish replenishes my Phlem. It's a pretty neat system.
An hour or so later, and I'm beginning to get a feel for increasing the height of the motte equally.
We've actually got so much fish that we need to make additional boxes.
...More to come!...