Yep I saw that too several years ago. If I remember correctly, they started with a hoola hoop with a diameter of 1.0 meter in a courtyard somewhere in Italy.
Yup--that's the one. Great IMAX show. You're correct--it was in Italy--Venice. With IMAX screens, you almost felt like you could reach out across the courtyard and touch the birds feeding in front of you.
What was amazing about that comparison was that it showed that there is a power at a macro-level in the cosmos that works at a very similar fashion to the micro-micro level of electron orbits and even below that.
Reminded me of a biblical passage about God holding all things together...it escapes me now.