Glossary of Threshold devices        

Collapsible Door
Unbreakable. Open even when locked. Pleasant to operate. Provides ventilation (scent of chervil and butter). Accords vision (she waits, still, in dotted Swiss). Even after collapse, consultation is feasible.

Fiber-Reinforced Door         
Lightweight. Easy to install. Fibers available: the lime-green zipper robe she hated as a child; an aunt’s rickrack-trimmed house dress. Special price: lover’s-duffel-coat-reinforced door.

Pocket Door
Disappears into a wall. Used when there’s no room for the swing of a hinged door. Used when no room for back-of-door hysteria. Variant: envelope-shaped and stitched to swing coat. Disappears into seam. Used when the notebook must not be seen.

Revolving Door
The metamorphosis of a door and its ancestor, the gate, into a machine that turns as she approaches. As she passes through a door permanently closed. Glass wings allow her to anticipate those departing, and the arrival of a woman with aluminum cane. Is that her.

Water Door
Secure. Robust. Pressure-tight. Lethe-resistant. Moves like water. Cannot be seen by ferryman. Arrives with memory intact.