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

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