I know there are bottom-up or roll-up shades and roman shades that have control mechanisms allowing them to be raised UP from the sill to any desired height on the window. But does such a thing exist for blinds? I'm talking regular, slat, tilting, mini-blinds.

For privacy reasons during certain parts of the day, I want to be able to raise blinds from the sill to, say, halfway up the window while leaving the top portion clear of any blind covering. I'd raise them all the way up at night, of course.

I've scoured the internet for such a thing and come up empty. Anyone have a clue on this one?

Thanks.