The blue ones always have the same diameter, but their height decreases. With them we will learn the difference between high and low.
The yellow ones are decreasing in both height and diameter. We will distinguish with them between big and small
The red cylinders all have the same height, but their diameter is getting smaller. We will understand the difference between wide and narrow.
The green cylinders increase in height, while their width decreases. This way we will see the difference between chubby and slender.