The button of soot has vanished into the limbo of superseded inventions.
Duncan's hand airily wafted the remark into the limbo of the negligible.
But we forget that our hero, like Tristram Shandy, is still in the limbo of non-existence.
As to leave, it has again vanished into the limbo of futurity.
Alas, that is not possible, for it must remain forever in the limbo of tradition.