There are 4 shapes on a 8x8 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 (6, 1)
Distance from target shape to gray rectangle at (6, 0): 1
Distance from target shape to purple square at (2, 1): 4
Distance from target shape to cyan right_triangle at (0, 5): 10
Closest shape is the gray rectangle at (6, 0) with distance 1</think>

<answer>(6, 0)</answer>