- Feed
- Base rate of fresh substrate, before the picture has its say.
- Kill
- How fast growth is taken back. Around centre this branches; below it the branches thicken into lobes and above they thin out and snap.
- Scale
- Thickness of one branch, and with it how fast the colony covers the frame.
- Terrain
- How much the picture decides where food is. At zero the colony ignores the frame; up high it will only grow into the lit parts and treats the shadows as rock.
- Relief
- Lighting across the branch faces. Turns a flat map into something with thickness.
- Tint
- Colour of the living tissue.
- Blend
- Weight of the colony over the picture underneath.
- Key light
- Which corner the light on the colony comes from.