1.   Conversely, luminous matter on this brane would be dark to observers in the other universe.

2.   In the grand scheme of things, we creatures of luminous matter, the very inventors of the simulation, were deemed irrelevant.

3.   Made from this obscure stuff called luminous matter, can we with our numbers succeed in capturing the whole?

4.   Most of the luminous matter in the universe is in the form of stars.