There are 5 shapes on a 8x8 grid. Which shape is closest to the purple rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: purple rectangle at (2, 0)
Distance from target shape to red trapezoid at (5, 6): 9
Distance from target shape to blue right_triangle at (2, 3): 3
Distance from target shape to yellow square at (5, 4): 7
Distance from target shape to green rectangle at (2, 7): 7
Closest shape is the blue right_triangle at (2, 3) with distance 3</think>

<answer>(2, 3)</answer>