We know about flash mobs. But online junctions are also poles that attract communal grieving, like the spot on a dead man's curve where a popular high schooler crashed.

Adherents of the savage ballet are surely aware that NFL star Sean Taylor died this morning from a gunshot wound he had suffered Sunday night. News of the shooting broke Monday morning, and of his death, earlier today.

Which made this otherwise innocuous YouTube of Taylor highlights posted over the summer an instant online shrine. Over 1,100 comments have been posted as of this writing (surely more by the time you click it) -- almost all of them during the past two days.

User interfaces are hardly limited to personal computers: even by a restrictive definition, they're ubiquitous around us from ballpoint pens to stick shifts.

Here, for instance, are some user interfaces for generating music through the vibration of strings: