What is a wall?
Its fundamental principle, of course, is division. Here from there, inside from outside, yours from mine. In Latin, the very word for “city” originally refers to the stones of its walls.
A wall needn’t be very much at all. Sometimes, indeed, a wall is little more than a line drawn in the air – think of the velvet rope outside an exclusive club.
Where they are more substantial, though, they tend to be conveniently vertical, and thus suitable for the presentation of imagery to members of an upright species with forward-facing eyes. We have always used walls to store and convey information, whether that meant telling stories, marking time, spreading the word, or remembering the fallen. (Lest we forget, they’ve also quite often been used to further somewhat less noble pursuits.)
If we are truly in an age when bits rule over atoms, then surely our walls are becoming virtual as well. What will we choose to do with them…and what can we expect them to look like?