diff --git a/Makefile b/Makefile
index 4f0b447..7ce8de7 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
-build/apad: main.cpp Pieces.cpp
+build/apad: main.cpp Pieces.cpp Pieces.h
 	mkdir -p build
-	clang++ -g -O0 -std=c++17 -o $@ $^ -lncurses
+	clang++ -g -O0 -std=c++17 -o $@ main.cpp Pieces.cpp -lncurses
 
 clean:
 	rm build/apad
diff --git a/Pieces.cpp b/Pieces.cpp
index e9ea342..f62d84c 100644
--- a/Pieces.cpp
+++ b/Pieces.cpp
@@ -330,3 +330,86 @@ void DrawPiece(const Piece &piece, int y, int x, Rotation rotation)
 	}
 }
 
+PieceData RotatePieceData(const PieceData &data, Rotation rotation)
+{
+	PieceData rtn;
+	switch(rotation)
+	{
+	default:
+	case Rotation::ROTATION_NONE:
+		return data;
+		break;
+	case Rotation::ROTATION_90:
+		// TODO(dev):
+		// TODO(dev): x's become y's
+		// TODO(dev): y's become max x - x's
+		// TODO(dev):
+		break;
+	case Rotation::ROTATION_180:
+		for(size_t row = 0; row < data.size(); ++row)
+		{
+			size_t opposite_row = data.size() - row - 1;
+			for(size_t col = 0; col < data[row].size(); ++col)
+			{
+				size_t opposite_col = data[opposite_col].size() - col - 1;
+				rtn[opposite_row][opposite_col] = data[row][col];
+			}
+		}
+		break;
+	case Rotation::ROTATION_270:
+		// TODO(dev):
+		// TODO(dev): I mean we could just rotate 90 & then 180,
+		// TODO(dev):  but that seems like the cheap way out.
+		// TODO(dev):
+		break;
+	};
+	rtn.resize(PD_PieceWidth(data));
+	for(auto row : data)
+	{
+		for(auto col : row)
+		{
+		}
+	}
+	return rtn;
+}
+
+unsigned PD_PieceHeight(const PieceData &data)
+{
+	return data.size();
+}
+unsigned PD_PieceWidth(const PieceData &data)
+{
+	size_t rtn = 0;
+	for(auto row : data)
+		rtn = std::max(rtn, row.size());
+	return rtn;
+}
+
+unsigned PD_PieceHeight(const Piece &piece, Rotation rotation)
+{
+	switch(rotation)
+	{
+	default:
+	case Rotation::ROTATION_NONE:
+	case Rotation::ROTATION_180:
+		return pieces.at(piece).size();
+		break;
+	case Rotation::ROTATION_90:
+	case Rotation::ROTATION_270:
+		return PD_PieceHeight(RotatePieceData(pieces.at(piece), Rotation::ROTATION_90));
+		break;
+	};
+}
+
+unsigned PD_PieceWidth(const Piece &piece, Rotation rotation)
+{
+	size_t rtn = 0;
+	for(auto row : pieces.at(piece))
+		rtn = std::max(rtn, row.size());
+	return rtn;
+}
+
+void PD_DrawPiece(const Piece &piece, int y, int x, Rotation rotation)
+{
+	//
+}
diff --git a/Pieces.h b/Pieces.h
index 971739f..af0b8e6 100644
--- a/Pieces.h
+++ b/Pieces.h
@@ -2,6 +2,8 @@
 #define APAD_PIECES_H
 
 #include <stdint.h>
+#include <unordered_map>
+#include <vector>
 
 enum Rotation {
 	ROTATION_NONE,
@@ -69,6 +71,75 @@ typedef uint8_t Piece; // only need literally 8, not 8 bits, but hey.
  *   [][][]
  */
 
+typedef std::vector<std::vector<bool>> PieceData;
+const std::unordered_map<Piece, PieceData> pieces =
+{
+	{
+		PIECE_ONE,
+		{
+			{ true,  true,  true, },
+			{ true,  true,  true, },
+		}
+	},
+	{
+		PIECE_TWO,
+		{
+			{ true,  false, },
+			{ true,  true,  },
+			{ true,  false, },
+			{ true,  false, },
+		}
+	},
+	{
+		PIECE_THREE,
+		{
+			{ false, true,  },
+			{ false, true,  },
+			{ false, true,  },
+			{ true,  true,  },
+		}
+	},
+	{
+		PIECE_FOUR,
+		{
+			{ true,  true,  },
+			{ true,  false, },
+			{ true,  true,  },
+		}
+	},
+	{
+		PIECE_FIVE,
+		{
+			{ true,  true,  false, },
+			{ false, true,  false, },
+			{ false, true,  true,  },
+		}
+	},
+	{
+		PIECE_SIX,
+		{
+			{ true,  true,  false, false, },
+			{ false, true,  true,  true,  },
+		}
+	},
+	{
+		PIECE_SEVEN,
+		{
+			{ true,  true,  },
+			{ true,  true,  },
+			{ true,  false, },
+		}
+	},
+	{
+		PIECE_EIGHT,
+		{
+			{ false, false, true,  },
+			{ false, false, true,  },
+			{ true,  true,  true,  },
+		}
+	},
+};
+
 unsigned PieceHeight(const Piece &piece,
                      Rotation rotation = Rotation::ROTATION_NONE);
 unsigned PieceWidth(const Piece &piece,
@@ -76,4 +147,14 @@ unsigned PieceWidth(const Piece &piece,
 void DrawPiece(const Piece &piece, int y, int x,
                Rotation rotation = Rotation::ROTATION_NONE);
 
+PieceData RotatePieceData(const PieceData &data, Rotation rotation);
+unsigned PD_PieceHeight(const PieceData &data);
+unsigned PD_PieceHeight(const Piece &piece,
+                     Rotation rotation = Rotation::ROTATION_NONE);
+unsigned PD_PieceWidth(const PieceData &data);
+unsigned PD_PieceWidth(const Piece &piece,
+                    Rotation rotation = Rotation::ROTATION_NONE);
+void PD_DrawPiece(const Piece &piece, int y, int x,
+               Rotation rotation = Rotation::ROTATION_NONE);
+
 #endif
diff --git a/main.cpp b/main.cpp
index 1d4246f..26ece23 100644
--- a/main.cpp
+++ b/main.cpp
@@ -39,7 +39,7 @@ int main(int argc, char *argv[])
 			try {
 				Piece piece = 0b111 & std::atoi(argv[input]);
 				DrawPiece(piece, y, 1);
-				y += PieceHeight(piece) + 1;
+				y += PD_PieceHeight(piece) + 1;
 			} catch(const std::exception &e) {
 				mvaddstr(y, 1, "std::atoi error");
 				y += 2;
@@ -118,16 +118,16 @@ void DemoPieces()
 		{
 			Piece piece = static_cast<Piece>(i);
 			DrawPiece(piece, y, x, rotation);
-			x += PieceWidth(piece, rotation) * 2 + 2;
+			x += PD_PieceWidth(piece, rotation) * 2 + 2;
 		}
 		// Always same height apart, sharing first piece with same-width row:
 		x = 2;
-		y = 10 + PieceHeight(0, rotation) + 1;
+		y = 10 + PD_PieceHeight(0, rotation) + 1;
 		for(auto i = 1; i < 8; ++i) // skip first
 		{
 			Piece piece = static_cast<Piece>(i);
 			DrawPiece(piece, y, x, rotation);
-			y += PieceHeight(piece, rotation) + 1;
+			y += PD_PieceHeight(piece, rotation) + 1;
 		}
 
 		getch();