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A strobe light can make the liquid look like it's flowing backwards. Just the right frequency, and blending it in with other cleverly-designed lighting, makes it hard to detect.
Disclaimer: I'm not a scientist and I don't play one on TV.
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'67 912, '70 911T, '81 911SC, '89 3.2 Targa - all sold before prices went crazy
'25 BMW 230i coupe - current DD
'67 VW Karmann Ghia convt. & '63 VW Beetle ragtop - ongoing projects
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