You're likely thinking of parenchyma cells, which are found in the majority of plant tissues. While they aren't perfectly brick-shaped, they are polygonal, meaning they have many sides, much like bricks. This shape is important because it allows for several key functions:

* Close packing: The polygonal shape allows these cells to pack tightly together, forming a strong, continuous tissue. This is crucial for structural support in plants, particularly in stems and leaves.

* Efficient transport: The tight packing and interconnectedness of parenchyma cells allow for easy transport of water, nutrients, and sugars throughout the plant. This is vital for the plant's overall growth and development.

* Storage: Parenchyma cells often serve as storage sites for various substances, including starch, sugars, and water. Their shape allows them to efficiently hold and release these materials when needed.

* Flexibility: While strong, the polygonal shape also allows for some flexibility, which is important for plants to bend and sway in response to environmental factors like wind.

So, the brick-like shape of parenchyma cells isn't just a random feature. It's a carefully designed structure that contributes to the overall efficiency and success of plants.