Can you know everything about colour if you see in black and white? A thought experiment

Can we ever know everything about something we can’t experience? The Australian philosopher Frank Jackson pondered this question in a thought experiment in 1982, which imagined a neuroscientist named Mary who understood everything there was to understand about colour vision, without ever having experienced it herself. If, in an instant, her black-and-white experience of sight shifted into colour, would she glean any new insight?

Detailed with stylish, shapeshifting animation in this short from TED-Ed, Jackson’s thought experiment ponders felt subjective experience (or ‘qualia’, for all the past and current philosophy students) and its relationship to knowledge. The questions raised by ‘Mary’s Room’ – including whether anything about experience transcends physical facts – remain some of the most perennial and unsettled in philosophy, even if Jackson himself actually reversed his position, concluding that the experience of colour vision does indeed correspond to a brain state, albeit one we don’t yet fully understand.

A trip to Montreal with Leonard Cohen in 1965 is a glimpse into a singular poetic mind

In 1965, the celebrated Canadian writer Leonard Cohen (1934-2016) took a trip from Greece, where he then lived, to his home city of Montreal. There, he visited friends and family, gave readings at a series of engagements and, more generally, renewed his ‘neurotic affiliations’. The Canadian directors Donald Brittain and Don Owen chronicled Cohen’s visit for their documentary Ladies and Gentlemen… Mr Leonard Cohen. The film finds Cohen – who, at just 30, is already an established and celebrated literary voice – drifting between live performances, snowy streets, bistros and the cheap hotels where he takes refuge. With their informal and engaging portrait, Brittain and Owen provide a riveting glimpse into Cohen’s life as an artist, centred on channelling ‘hypersensitivity and an enormous curiosity’ into witty, penetrating and often enigmatic poetry and prose.

The incredible – and still quite mysterious – way trees trade information via their roots

While researching her doctoral thesis, Suzanne Simard, now a professor of forest ecology at the University of British Columbia, made an astounding discovery – trees in forests seem to possess complex information superhighways in their root systems that allow them to share information. Her 1995 doctoral thesis on the topic has been part of a revolution in how scientists view plants, leading many to suggest that they possess cognitive abilities, and even intelligence. This animation from TED-Ed details the symbiotic relationship – between tree roots and fungi called mycorrhizae – that serves as the foundation of these intricate intra-tree communication networks, allowing them to trade news on topics such as drought and insect attacks, and even detect if an incoming message has been sent by a close relative.

Dissolve into the immersive, entrancing rhythms of a Sufi chant

A ritual at the heart of Sufism, the dhikr is a demonstration of devotion in which worshippers share in a meditation on Allah via synchronised group chants, rhythmic movements and, in some instances, the spinning dances of whirling dervishes. The Dutch-Chinese-American filmmaker Jasmijn Schrofer drops viewers into the rhythms of the dhikr in her short film Tarikat (‘The Path’). Through the ritual of sound and movement, the individuals seem to dissolve into a unified whole, even as Schrofer often lingers on the close-up expressions of each one. The result is an intimate and immersive viewing experience in which viewers might just find themselves lost in a trance alongside the faithful.

How moth larvae carve out cozy, mobile homes inside Mexican jumping beans

You might know that moth larvae are the hidden creatures that make Mexican jumping beans jump. You might also know that Mexican jumping beans aren’t ‘beans’ at all, but seed pods – those of a shrub native to the Sonoran Desert, which straddles the border of Mexico, Arizona and California. But, as this video from the science documentary series Deep Look explores, burrowing further into the lives of Mexican jumping bean inhabitants still makes for highly fascinating viewing. Captured in stunning 4K resolution, this short film documents the months that a jumping bean moth larva spends hollowing out, residing inside, and manually repairing and relocating its 10mm home, before ultimately emerging in its mature form.