i only really see the movement in b and c

woah it was not as obvious in lecture but on my laptop now I see it

I can't see any of the pictures moving

Agreed, the movement is much more noticeable on my laptop screen

I am collecting these types of images. Is this a theme with SIGGRAPH?

Yep, way more noticeable on my laptop.

i also only see movement in b and c

I only see c moving lol

b and c move for me but not a