There are 6 shapes on a 7x7 grid. Which shape is closest to the blue 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: blue rectangle at (0, 3)
Distance from target shape to green rectangle at (2, 4): 3
Distance from target shape to red rectangle at (6, 6): 9
Distance from target shape to brown trapezoid at (3, 0): 6
Distance from target shape to yellow right_triangle at (5, 6): 8
Distance from target shape to cyan rectangle at (6, 4): 7
Closest shape is the green rectangle at (2, 4) with distance 3</think>

<answer>(2, 4)</answer>