Demonstrate conservation of size, i.e. the cylinder container may look bigger because it is taller than the shorter basin container, but when pouring one into another they contain the same amount ,1lt .
Mathematical concepts are built whilst playing with this 4 piece Litre set, such as: Empty / full, Heavy / light
More than / less than Shallow / deep Greater than / less than Liquid measure.
They also become aware that water will take the shape of it's container.