For me, the two white gratings appear to move down like falls.pic.twitter.com/Ib8HerWIxS
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You're welcome 
The left white bar looks wider than the right.
Excellent!!
The white ones move down and/or the black ones move up, but only very slowly. Very small effect. Right white bar maybe slightly wider?
The same width
Yes but verrrrrrrrry slow.
I see it but it is very subtle.
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