Eckhart Tolle argues that space itself is the best meditation object. Focusing on the night sky's vast, dark expanse evokes depth and boundlessness. The sheer vastness that contains billions of stars is more inconceivable than the stars themselves.
Chapters
The best meditation object perhaps is, in the external world, is space. Because there are certain things that outer space has in common with inner space. So if you focus on outer space, and you do that when you look out at night, you look up into space, the vast darkness of space, and you can sense the unbelievable, inconceivable depth and vastness of it. That's even more awe-inspiring than the fact that there are billions and billions of stars or suns and galaxies there, that's incredible too, that's inconceivable too. So the only thing that's more inconceivable than the multiplicity of celestial objects is the vastness of the space that contains them all, that enables them to be there.