There are 6 shapes on a 4x4 grid. Which shape is closest to the yellow 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: yellow rectangle at (1, 1)
Distance from target shape to orange square at (3, 0): 3
Distance from target shape to pink rectangle at (3, 3): 4
Distance from target shape to cyan trapezoid at (2, 1): 1
Distance from target shape to gray trapezoid at (0, 1): 1
Distance from target shape to brown rectangle at (2, 2): 2
Closest shape is the cyan trapezoid at (2, 1) with distance 1</think>

<answer>(2, 1)</answer>