- Airplane wings can lift tonnage by the differences in air pressure between the top and bottom surface.
- Put two equal weight people on a teeter totter and nothing happens.
- Place two identical objects on a balance beam scale, even if they are massive, and you get nothing.
- Pea gravel doesn't come naturally—only rocks having a common size are sorted through an appropriate filter.
- Attach two wires of a lightbulb to the + terminal of a battery, you get nothing—moved to the opposite pole, light.
- We create the phantom third channel of stereophonic sound from elements common to left and right—differences are filtered out of the center.
What do airplane wings, teeter totters, balancing scales, subtraction, gravel sorters, batteries, stereophonic sound, and balanced audio have in common? They all rely on differences.
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