There are 4 shapes on a 6x6 grid. Which shape is closest to the orange right_triangle 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 right_triangle at (1, 5)
Distance from target shape to gray trapezoid at (2, 4): 2
Distance from target shape to blue square at (1, 0): 5
Distance from target shape to pink trapezoid at (4, 5): 3
Closest shape is the gray trapezoid at (2, 4) with distance 2</think>

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