By infinite degrees, the walls became perfectly transparent, together with the machinery, and he realized that the light was coming from a world without.

Flesh, rock, metal-any material substance was perfectly transparent to thought.

You cannot make anything that is perfectly transparent.

In the same way, a short line of sight through air seems perfectly transparent.

In the ceiling was an oval of optical glass that should be perfectly transparent to the laser's frequency.

Its perfectly transparent shape glimmered wetly in the overhead light.

Now the sheet changes colour, becoming perfectly transparent save for a violet border.

His rich orange-red varnish, perfectly transparent, gave the final touch.

The air at ground level was perfectly transparent.

Nor does human knowledge include any perfectly transparent, non-refractive solid such as the substance of this building.