>>14367656you have to consider the object over time to consider it a 4D object.
The 4D object is the lifetime of the mushroom cloud
The 3D object is the mushroom cloud at any frozen moment in time.
The 2D object is the mushroom cloud as observed from sufficiently far enough away. A closer observation would have 2D and 3D components, because angles.
A 1D object would be where the center of mass of the 4D object was.
Can't do 0D object, sorry. Too much for me.