There are 4 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 gray square at (2, 6): 5
Distance from target shape to yellow trapezoid at (6, 3): 6
Distance from target shape to pink rectangle at (1, 6): 4
Closest shape is the pink rectangle at (1, 6) with distance 4</think>

<answer>(1, 6)</answer>