There are 6 shapes on a 8x8 grid. Which shape is closest to the blue 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: blue trapezoid at (1, 3)
Distance from target shape to red square at (4, 5): 5
Distance from target shape to purple right_triangle at (2, 6): 4
Distance from target shape to pink trapezoid at (7, 2): 7
Distance from target shape to gray right_triangle at (2, 4): 2
Distance from target shape to orange rectangle at (5, 3): 4
Closest shape is the gray right_triangle at (2, 4) with distance 2</think>

<answer>(2, 4)</answer>