Stained Unravel: the different cell kinds

Each cell in the grid is a quad (four-point polygon) that morphs between the following shapes.

Empty

Kind	Symbol	Description
0	·	All four points collapsed to the center — invisible.

Kind	Symbol	Description
9	■	Full square occupying the entire cell.
10	⬧	Diamond — points at the midpoint of each edge.

Right-angle triangles that fill exactly half a cell diagonally.

Kind	Symbol	Description
1	◢	Bottom-right triangle — hypotenuse runs from top-left to bottom-right corner.
2	◣	Bottom-left triangle — hypotenuse runs from top-right to bottom-left corner.
3	◥	Top-right triangle — hypotenuse runs from top-left to bottom-right corner.
4	◤	Top-left triangle — hypotenuse runs from top-right to bottom-left corner.

Isoceles triangles with a tip at the midpoint of one edge and the base on the opposite edge.

Kind	Symbol	Description
5	▲	Tip at top center, base along the bottom edge.
6	▼	Tip at bottom center, base along the top edge.
7	◀	Tip at left center, base along the right edge.
8	▶	Tip at right center, base along the left edge.

Axis-aligned rectangles occupying exactly half the cell.

Kind	Symbol	Description
11	▀	Top half — from the top edge to the vertical midpoint.
12	▄	Bottom half — from the vertical midpoint to the bottom edge.
13	▌	Left half — from the left edge to the horizontal midpoint.
14	▐	Right half — from the horizontal midpoint to the right edge.

Very shallow triangles that hug one corner, spanning the full width but only half the height of the cell.

Kind	Symbol	Description
15	◢ (flat)	Bottom-right wedge — fills the bottom-right corner, rising from the bottom edge to mid-height on the right side.
16	◣ (flat)	Bottom-left wedge — fills the bottom-left corner, rising from mid-height on the left to the bottom-right.
17	◥ (flat)	Top-right wedge — fills the top-right corner, dropping from the top edge to mid-height on the right side.
18	◤ (flat)	Top-left wedge — fills the top-left corner, dropping from mid-height on the left to the top-right.

Very narrow triangles that hug one corner, spanning the full height but only half the width of the cell.

Kind	Symbol	Description
19	◢ (standing)	Bottom-right wedge — fills the bottom-right corner, from the bottom edge up to mid-width on the right side.
20	◣ (standing)	Bottom-left wedge — fills the bottom-left corner, rising to mid-width on the left side.
21	◥ (standing)	Top-right wedge — fills the top-right corner, from the top edge down to mid-width on the right side.
22	◤ (standing)	Top-left wedge — fills the top-left corner, from the top edge down to mid-width on the left side.