There are 6 shapes on a 6x6 grid. Which shape is closest to the brown trapezoid 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 trapezoid at (2, 1)
Distance from target shape to orange trapezoid at (0, 3): 4
Distance from target shape to pink trapezoid at (1, 3): 3
Distance from target shape to gray rectangle at (4, 5): 6
Distance from target shape to cyan right_triangle at (5, 0): 4
Distance from target shape to purple right_triangle at (0, 5): 6
Closest shape is the pink trapezoid at (1, 3) with distance 3</think>

<answer>(1, 3)</answer>