There are 6 shapes on a 8x8 grid. Which shape is closest to the blue 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: blue square at (3, 4)
Distance from target shape to purple square at (0, 3): 4
Distance from target shape to orange square at (6, 6): 5
Distance from target shape to yellow square at (3, 6): 2
Distance from target shape to brown trapezoid at (6, 7): 6
Distance from target shape to gray square at (0, 7): 6
Closest shape is the yellow square at (3, 6) with distance 2</think>

<answer>(3, 6)</answer>