Jodo Kast May 13, 2010
I no longer have the faintest idea of what a table is. Both Bertrand Russell and Max Planck brought this most curious question to my attention, because they did take it very seriously.
They point out that if your senses are disabled, then you can't know anything about a table (so what is a table?). This is truly not a trivial problem, although it seems laughable.
This is where I chime in.
How does one define the edges of a table? Since you can stand back a few feet from a table and still experience it, that must mean the table extends a few feet beyond its physical existence. You can know about a table because of the reflected photons. Thus, the real edges of the table are the photons. If you disable your ability to detect photons then the edge will creep back to where it activates your tactile sense. If you disable your tactile sense and still can't detect photons, then you'll have to smell it, hear it, taste it, burn it, or have someone put it on your back. While you won't feel the table on your back, you'll still be able to detect gravity and thus sense your weight has increased. If you burn the table, then the odor molecules will collect in your nose and the rise in room temperature will become apparent.
Does a table have an objective reality? I have to say that it does, but I'm not sure what it could be. The foremost problem is does the table have a surface? Well, to our tactile sense it sure does. But imagine if your fingers are thinner than neutrons. You might not find a surface. That's why this problem is not trivial.