The main criteria for what exists —
causal power, indispensability,
mind-independence — and where they
disagree, tested against numbers,
colours and institutions.

What Would It Mean to Be Real?

Three criteria tested against numbers, colours, institutions.

Prompt

Compare the main criteria philosophers use for what exists — causal power, indispensability to our best theories, mind-independence — and show where they disagree, using numbers, colours and institutions as test cases.