There are 6 shapes on a 4x4 grid. Which shape is closest to the yellow 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: yellow rectangle at (0, 0)
Distance from target shape to purple right_triangle at (3, 0): 3
Distance from target shape to gray rectangle at (1, 3): 4
Distance from target shape to pink rectangle at (3, 3): 6
Distance from target shape to brown square at (0, 1): 1
Distance from target shape to cyan right_triangle at (2, 2): 4
Closest shape is the brown square at (0, 1) with distance 1</think>

<answer>(0, 1)</answer>