There are 6 shapes on a 7x7 grid. Which shape is closest to the orange 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: orange rectangle at (3, 6)
Distance from target shape to purple right_triangle at (2, 4): 3
Distance from target shape to gray trapezoid at (3, 1): 5
Distance from target shape to cyan rectangle at (1, 5): 3
Distance from target shape to blue trapezoid at (4, 3): 4
Distance from target shape to yellow right_triangle at (5, 0): 8
Closest shape is the purple right_triangle at (2, 4) with distance 3</think>

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