The Four Square timer has a flow between 4 compartments, with a centre of coloured oil containing a little creature.
The coloured liquid won't mix with our dissove into the clear liquid. Because they don't mix we can observe gravity at work with the heavier coloured liquid always flowing to the bottom of the timer
A calming and mesmerising device that can be used by those affected by sensory overload.
Ages 3 Yrs+