All diligent students of the philosophy of relativistic mechanics would know about Enderton's perceptive remark that we are not aware of time in the same ways as space because we are not blessed with a pair of eyes in rapid relative motion. There seem to be sound bioengineering reasons for this optical opportunity having so far been overlooked by evolution. Fortunately, it seems that it is not necessary to have a pair of eyes moving apart at relativistic speed to be able to understand what we see when we look along the time axis. At least as far as I am able to tell, a pretty convincing 4D effect ought to be produced by seeing with two eyes displaced from each other in time. Unless and until such necessary genetic modifications can be introduced by the U-Genic Division and allowed to enter the human gene pool, we propose an ocular prosthetic solution to the problem. Rather like those natty red-and-green glasses which you used to use to watch seedy cinema films, we suggest that you try to train yourself to see timewise by wearing KronoSpex[TM] shortly to be available at vast expense from X Optical. KronoSpex employ planar lenses made with mindbogglingly different refractive indexes so that the eyes are given views of the world delayed by different amounts. Early versions of KronoSpex are available with one negligible delay and one delay of a few milliseconds. In the next Quarter we expect to deliver models with separations of seconds or longer although work is still needed to deal with the gravitational distortion of the head caused by the proximity of such dense stuff. Greater separations will make it easier for the wearer to see timewise, but we expect some users to experience nostalgic difficulty akin to falling sidewards because of the bias in delay. The research division is currently working on a special fast glass with a reciprocal refractive index. It will thus be possible to make time-balanced KronoSpex giving a pair of images whose average time is the present. We also anticipate lucrative defence and espionage markets for another device, provisionally named LookAhead, that will be constructed with two matched fast glass lenses. Security considerations might preclude full disclosure. Our Traffic Division plans road trials of fast glass in windscreens to see whether it really improves safety or just makes life in the fast lane a lot more disturbing.
We expect an adult domestic market for fast glass, too.