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

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