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

<answer>(2, 3)</answer>