There are 3 shapes on a 8x8 grid. Which shape is closest to the blue 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: blue rectangle at (3, 6)
Distance from target shape to brown right_triangle at (0, 6): 3
Distance from target shape to yellow right_triangle at (7, 0): 10
Closest shape is the brown right_triangle at (0, 6) with distance 3</think>

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