One night when I was sleeping I had a dream.
I was visiting a Swedish funfair. There I saw a ride
that I had never seen before. It was red and white in color
and it looked very old. The mechanism was quite simple but
ingenious. Then I noticed that it was a dream so I studied
the mechanism carefully in order to be able to build a model
of it when wake up. So here it is...

The gondolas spin around at the same time as they go up and down.
The two gondolas balance each other so it's very light to turn.

Video here: