Episode 3 Ol and Val discover that they exist & Val becomes a penguin on an iceberg

Exploring the second of Descartes' Meditations, during which the Rene pulls a fast one and uncovers the famous cogito as his rock of certainty - "I think therefore I am" - although not quite in those words, and in which he ransacks the corners of his mind trying to figure just what on earth this 'I' is, that now finally exists...which has something to do with a lump of melting wax.