11 ideas
| 21227 | The Cogito demands a bridge to the world, and ends in isolating the ego [Velarde-Mayol] |
| 21215 | The representation may not be a likeness [Velarde-Mayol] |
| 6417 | In 1921 Russell abandoned sense-data, and the gap between sensation and object [Russell, by Grayling] |
| 6474 | Seeing is not in itself knowledge, but is separate from what is seen, such as a patch of colour [Russell] |
| 6476 | We cannot assume that the subject actually exists, so we cannot distinguish sensations from sense-data [Russell] |
| 2792 | It is possible the world came into existence five minutes ago, complete with false memories [Russell] |
| 22326 | Knowledge needs more than a sensitive response; the response must also be appropriate [Russell] |
| 6475 | In perception, the self is just a logical fiction demanded by grammar [Russell] |
| 1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
| 21219 | Find the essence by varying an object, to see what remains invariable [Velarde-Mayol] |
| 5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |