The Impossible Hourglass
seen from China
seen from Russia
seen from United States
seen from Russia
seen from United States
seen from United States
seen from Spain
seen from China
seen from United States
seen from Thailand
seen from United States

seen from United States
seen from United States
seen from United States
seen from China

seen from Russia
seen from United States
seen from United States
seen from Germany
seen from Malaysia
The Impossible Hourglass
A strong electric charge being applied to water causing an increase in surface tension - enough to form a bridge.
Physics
You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird... So let's look at the bird and see what it's doing — that's what counts. I learned very early the difference between knowing the name of something and knowing something.
Richard Feynman