If you have the rock salt that is needed to make homemade ice cream, then look to see if one of those grains has the same shape. This shape is called a simple cubic crystalline structure. This is one of the things that makes wool so warm. Those are plant cells. Plant cells are different from animal cells.
Plant cells have a strong, sturdy cell wall.
Animal cells do not. They have different jobs. There are phloem cells clumped in groups around the middle also. Phloem cells are like pipes, letting the food that was made in the leaves travel to the rest of the plant. The clumps of green, larger cells close to the purple clumps of cells around the middle are called xylem.