A little push makes this black and white... yes, what is it anyway.... tip dangerously to one side, but it quickly gets back up and wobbles and spins happily back and forth until it comes to a stop again.
This tumbler is very suitable for placing on the floor for a child in the prone position. The child is invited to stretch and move forward to touch the tumbler. But it will not roll away, which improves motivation.
What is special is that he can take uncle with him in the bath or outside in the water in the summer, where he also happily tumbles on the water.