On 10/06/2021 10:57, R D S wrote:

Some sort of ferris wheel like contraption?

An acquaintance had a unit with a high ceiling.
He had a sort of floor to ceiling cabinet that had shelves in it that he
could call up to present themselves at an opening at the front.

There were plainly 2 columns of shelves which could travel around and up
and over.

I'm struggling to Google and find such.