diff --git a/app/src/main/java/school_project/Piece.java b/app/src/main/java/school_project/Piece.java
new file mode 100644
index 0000000..f5dde6b
--- /dev/null
+++ b/app/src/main/java/school_project/Piece.java
@@ -0,0 +1,31 @@
+package school_project;
+
+public class Piece extends Shape{
+
+    public Piece() {
+        super();
+    }
+
+    public Piece(boolean[][] matrix) {
+        super(matrix);
+    }
+
+    /**
+     * Rotate the matrix of the piece. Used when the player right click
+     * TODO: ALGORITHME INCORECTE, A REFAIRE <tonitch>
+     *
+     * @param times Set the amount of time the rotation should be executed. Should be set between 1 and 3.
+     */
+    public void RotateRight(int times){
+        while(times > 0) {
+            boolean[][] temp_matrix = new boolean[width][height];
+            for (int i = 0; i < height; i++) {
+                for (int j = 0; j < width; j++) {
+                    temp_matrix[j][i] = matrix[i][j];
+                }
+            }
+            times--;
+            matrix = temp_matrix;
+        }
+    }
+}
\ No newline at end of file
diff --git a/app/src/main/java/school_project/Shape.java b/app/src/main/java/school_project/Shape.java
new file mode 100644
index 0000000..7f52580
--- /dev/null
+++ b/app/src/main/java/school_project/Shape.java
@@ -0,0 +1,40 @@
+package school_project;
+
+
+public class Shape {
+
+    protected boolean[][] matrix;
+    protected int height, width;
+
+    public Shape() {
+        matrix = new boolean[0][0];
+    }
+
+    public Shape(boolean[][] matrix){
+        this.setShape(matrix);
+    }
+
+    public void setShape(boolean[][] matrix) throws IllegalArgumentException{
+        height = matrix.length;
+        width = matrix[0].length;
+
+        for (boolean[] row: matrix){
+            if(row.length != width){
+                throw new IllegalArgumentException("The argument should be a square matrix");
+            }
+        }
+        this.matrix = matrix;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public boolean[][] getShape() {
+        return matrix;
+    }
+}
\ No newline at end of file
diff --git a/app/src/test/java/school_project/PieceTest.java b/app/src/test/java/school_project/PieceTest.java
new file mode 100644
index 0000000..ad9e23c
--- /dev/null
+++ b/app/src/test/java/school_project/PieceTest.java
@@ -0,0 +1,60 @@
+package school_project;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class PieceTest {
+
+    @Test
+    void rotateRight() {
+        boolean[][] piece1_matrix = {
+            {true, false, false},
+            {false, true, false},
+            {true, true, false},
+        };
+
+        boolean[][] piece1_matrix_result = {
+                {true, false, true},
+                {false, true, true},
+                {false, false, false},
+        };
+
+        boolean[][] piece2_matrix = {
+                {true},
+                {false},
+                {true},
+        };
+
+        boolean[][] piece2_matrix_result = {
+                {true, false, true},
+        };
+
+        boolean[][] piece3_matrix_result = {
+                {false, false, false},
+                {true, true, false},
+                {true, false, true},
+        };
+
+        Piece piece1 = new Piece();
+        piece1.setShape(piece1_matrix);
+
+        Piece piece2 = new Piece(piece2_matrix);
+
+        Piece piece3 = new Piece(piece1_matrix);
+
+        Piece piece4 = new Piece(piece1_matrix);
+
+        piece1.RotateRight(1);
+        assertArrayEquals(piece1_matrix_result, piece1.getShape());
+
+        piece2.RotateRight(1);
+        assertArrayEquals(piece2_matrix_result, piece2.getShape());
+
+        piece3.RotateRight(3);
+        assertArrayEquals(piece3_matrix_result, piece3.getShape());
+
+        piece4.RotateRight(3);
+        assertNotEquals(piece1_matrix_result, piece4.getShape());
+    }
+}
\ No newline at end of file
diff --git a/app/src/test/java/school_project/ShapeTest.java b/app/src/test/java/school_project/ShapeTest.java
new file mode 100644
index 0000000..c5e6fd3
--- /dev/null
+++ b/app/src/test/java/school_project/ShapeTest.java
@@ -0,0 +1,48 @@
+package school_project;
+
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class ShapeTest {
+
+    @Test
+    void setShape() {
+        boolean[][] matrix_shape1 = {
+                {true, false},
+                {true, true},
+                {true, false}
+        };
+        boolean[][] matrix_shape2 = {
+                {true, false, true},
+                {true, true, true},
+                {true, false, true},
+        };
+        boolean[][] matrix_shape3 = {
+                {true, false, true},
+                {true, true}
+        };
+
+        boolean[][] matrix_shape4 = {
+                {true},
+                {false},
+                {true}
+        };
+
+        Shape shape1 = new Shape();
+        shape1.setShape(matrix_shape1);
+        assertEquals(3, shape1.getHeight());
+        assertEquals(2, shape1.getWidth());
+
+        Shape shape2 = new Shape(matrix_shape2);
+        assertEquals(3, shape2.getHeight());
+        assertEquals(3, shape2.getWidth());
+
+        assertThrows(IllegalArgumentException.class, () -> new Shape(matrix_shape3));
+
+        Shape shape4 = new Shape(matrix_shape4);
+        assertEquals(3, shape4.getHeight());
+        assertEquals(1, shape4.getWidth());
+
+    }
+}
\ No newline at end of file