Eva is here

One day, they looked, and there she was, Eva.
A cute nice Oval, Eva was beatiful.
They never have seen an oval before, so they liked it a lot
and she too, could spin, and rotate, and twirl, and gyrate!
Eva was their friend, and the three of them played all day long.

It was a perfect universe, a perfect world!

Until one day...

What do you think is going to happen?
Why do you think Eva is an Oval?
What is the difference between an Oval and a cube?
Why do you think they can not move?
And did you notice Bob is the only one getting a light?
Where does the light come from?