Think
of a speck.
Is it of dust?
Perhaps something else?
Maybe it is a being, a microorganism shaped like nothing.

Imagine
that it exists within an unbound expanding and imploding space, one that transforms countless times in each infinitesimal unit of a moment.

Now,
wonder if our speck is also such a space, holding something.

For this being or non-being, substitute any and all imagery; worms, balloons, the depths of a star-studded universe, and so on.

Finally, place it inside your head.

Then, you might come close.