Type your password and a steel shutter rolls up off your desktop. Three seconds, once a day, for no reason other than it feels good.
That is the whole product. It plays on unlock.
A laptop lid is not a threshold. This gives you one, so starting work feels like opening up for the day.
Hooks the system's screen-unlock event, draws a full-screen overlay, rolls it up, gets out of the way.
Long enough to feel deliberate, short enough that you never once wish you could skip it.
It is a Lua config for Hammerspoon, the free Mac automation tool, not a separate app to install.
Slat size, speed, easing and colour are all plain values at the top of the file. Change them and reload.
Free. It is a Hammerspoon config, so I will send the file plus setup steps.
A human replies, usually the same day.