There are 3 shapes on a 8x8 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 (0, 1)
Distance from target shape to gray square at (6, 1): 6
Distance from target shape to purple trapezoid at (7, 7): 13
Closest shape is the gray square at (6, 1) with distance 6</think>

<answer>(6, 1)</answer>