Reality is relative to the
observer, so by analogy, a table is “solid” because our hands are made of the same atoms as the
table. To a neutrino, the table is just a ghostly insubstantiality through which it flies, as is the
entire earth. Things constituted the same way are substantial to each other, so likewise what is
“real” depends upon the world it is measured from.

Ziyu He
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