Where The Wild Thoughts Are What is 'Now'?
Feb 16, 2026
Ian Sample, science journalist and host of The Guardian’s Science Weekly, steps in as interviewer. Jo Marchant talks about her new book exploring the present moment. They probe physics’ block-universe, sensory delays and predictive brain mechanisms. Conversation touches on cultural timeviews, altered time in mind states, and whether Now is illusion or a meaningful, stitched-together experience.
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Relativity Removes A Single Universal Now
- Physics offers no single universal Now; simultaneity is perspective-dependent.
- Jo describes Einstein's view and the block universe: events are plotted in spacetime but nothing objectively 'happens' there.
The Brain Rebuilds The Present From Delayed Signals
- Perception lags and differs across senses so our experienced Now is constructed, not direct.
- Jo gives examples: light/sound delays, dubbed movies, and how the brain integrates asynchronous signals into one moment.
When The Present Jumps The Tea Overflows
- Echinotopsia shows moments can arrive as jumps rather than smooth flow.
- Jo recounts a woman who saw pouring tea frozen then suddenly jump, causing overflow because perceived motion was discontinuous.
