There are 6 shapes on a 8x8 grid. Which shape is closest to the orange 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: orange square at (6, 4)
Distance from target shape to brown rectangle at (6, 2): 2
Distance from target shape to gray rectangle at (1, 3): 6
Distance from target shape to blue trapezoid at (6, 3): 1
Distance from target shape to cyan trapezoid at (4, 3): 3
Distance from target shape to green square at (4, 2): 4
Closest shape is the blue trapezoid at (6, 3) with distance 1</think>

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