There are 4 shapes on a 6x6 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, 1)
Distance from target shape to cyan right_triangle at (5, 5): 9
Distance from target shape to brown square at (2, 0): 3
Distance from target shape to red right_triangle at (3, 5): 7
Closest shape is the brown square at (2, 0) with distance 3</think>

<answer>(2, 0)</answer>