Intersubjectivity

The big idea: Solipsism pictures you as a lonely mind guessing whether anyone else is out there. But look at an ordinary moment — sharing a joke, following a pointing finger, queuing for a bus.

You're not guessing about other minds at all. You're already inside a shared world with them, taking each other for granted.

That shared world is what philosophers call intersubjectivity. This micro is the reply to solipsism from the other direction: not proving others exist, but noticing we were always with them.

One school of thought made this its central claim by describing experience carefully, from the inside.

Husserl and Merleau-Ponty: the world comes pre-shared: Edmund Husserl and Maurice Merleau-Ponty did phenomenology. Their finding: your world never shows up as private. A cup shows up as 'a cup anyone could pick up'; words show up as 'words others also understand'. Even alone in a room, the world is soaked in other people. Merleau-Ponty added that we read each other through the body — you feel a friend's sadness in their slumped shoulders before a single word. We're not sealed minds guessing about each other; we're always already among others.

Checkpoint — phenomenology: In one line: describe experience honestly and you find you're always already among others — the world comes pre-shared. Hold that — the next thinker asks HOW you meet the others in that shared world.

If we share one world, everything turns on how we treat the people in it.

Buber: I–Thou vs I–It: Martin Buber said there are two ways to relate to another person. In I–It you treat them as a thing: the cashier who's just 'the queue moving', a person you size up for what they can do for you. In I–Thou you meet them fully as a you — really present, one person to another. The same barista can be an 'It' (a coffee-dispenser) or a 'Thou' (a person you truly greet). For Buber, you only become a full self in genuine I–Thou meetings.

Go further — higher-level insight: See how these two link up. Phenomenology shows the shared world is a fact — we're already among others. Buber turns that into a choice: given that others are there, do you meet them as a Thou or reduce them to an It? Fact plus choice is a strong essay shape — one describes our situation, the other tells us what to do in it.

Checkpoint — Buber: In one line: you can treat a person as an It (a thing) or meet them as a Thou (a you) — and only real Thou-meetings make you a full self.