is 1 – an entity indexed in a single table,
is 2 – a relationship in a join table,
is 3 – a node in 3 dimensions (space + time),
nodes form webs
webs need internal contexts and controls
controls exists in three states
states determine the visualization of webs
visualization is interactive
interaction involves searching, mapping and creation
interaction using 5 ideas (left/right, up/down, above/below, yes/no, in/out)
can be shared