Two "Stages".

       I'm not 100% sure if I have/have not tried this before I've not checked; hope it's not an annual event.
       The annual pilgrimage or the Clan gathering.  They have, that I know of four Bedrooms 1 for them, one for elder Sprog, one for younger Sprog and one for visitor(s) Maybe out of deference to my knees or lack of an upstairs bedroom I get a VERY comfortable Bed downstairs.
       These lights kinda fascinated me first time; I saw the "Bubbles & tried to capture them.  Here you see two of the steps in then process.
       What you can't see when "on" properly, is any hint of graduation in Ceiling brightness.