A Herculean fish and the fight against a $6 billion mega-dam project in Alaska

Energised by a charming, eclectic cast of characters, including the titular fish, The Super Salmon dives into a civic battle between government bureaucrats and grassroots activists over the proposed Susitna-Watana Dam in southern Alaska: a $6 billion project that critics believe would greatly damage a vital salmon-spawning area. Planned at a time when mega-dams have largely fallen out of fashion with US energy and environment experts, the project was set to become the second-largest dam in North America before being suspended indefinitely in 2016. Combining perspectives from all sides of the fight with the story of the ‘ninja of all salmon’ – a radio-tracked fish that made a near-mythic spawning journey up the Susitna river – the director Ryan Peterson injects the frequently dry, so-serious environmental activism documentary genre with a refreshing dose of verve and humour, all without losing sight of the issues.

Surgeons with chainsaws – the breathtaking craft of logging on a Swiss mountainside

In most of the world, logging is now largely the work of massive machinery. But in the steeply sloped woods above Lake Ägeri in Switzerland, a combination of chainsaws, jacks, muscles and gravity is still the most effective means of bringing down trees for lumber. Once every four years, skilled loggers travel to the area to collect mature trees in a sustainable harvesting tradition that, in turn, allows saplings to take in sunlight and flourish. After felling the trees at careful angles, the workers send them careening through the woods with spectacular speed and force until they reach the water below with a satisfying splash. From there, the timber is floated downriver into town. The loggers’ confident expertise masks the immense dangers of the job, which could easily turn deadly in an instant. With stunning cinematography, Ins holz (In the woods) offers a rare look at this nearly extinct practice and the culture that surrounds it, making for a deeply visceral and visually stunning celebration of a hard day’s work.

A meditative cinepoem from 1929 captures the reflective, ethereal wonders of water

The US photographer and filmmaker Ralph Steiner (1899-1986) is widely considered to be a pioneer of both media, celebrated for his century-spanning work in modernist photography and documentary and avant-garde film. H₂O (1929), his debut short and one of the earliest US art films, is a meditative, visual ode to water in its many forms, focused on the liquid’s various textures and shape-distorting reflective qualities. In a series of static yet dynamic shots, water-spewing pipes and fire hydrants, waterfalls, raindrops, slow-flowing streams, and the shimmering surfaces of near-stagnant bodies appear on screen, with the visuals gradually becoming more abstract as Steiner transitions to closeups of water surfaces. This version of the film features a new original piano score from the Illinois-based composer William Pearson, commissioned by Aeon. H₂O is frequently mentioned alongside another documentary touchstone of the same year: Regen, by the Dutch directors Joris Ivens and Mannus Franken, which celebrates Amsterdam in the rain.

When being watched is your work – life inside a Chinese live-streaming company

On China’s state-controlled internet, live-streaming fills a role similar to YouTube in the United States, allowing young people to keep up with, and even interact with, their favourite internet personalities. It’s also boomed into a multibillion dollar industry, driven by ‘gifts’ – small amounts of money sent from viewers to streamers – and brand partnerships. Live Streamer chronicles a day in the life of one Beijing-based web personality, Jing Zi, as she offers beauty tips, sings songs and, most popularly, eats for her young fanbase. The work is challenging, requiring her to entertain viewers for up to seven hours a day, but she also says it feels good to be cared for by so many fans. Live Streamer is part of the Shanghai-based US filmmaker Noah Sheldon’s Work-is documentary series, which ‘sets out to catalogue the labour force of China in a more intimate and granular way, using voices and personal histories to colour the notion of what it means to be working in modern China’.

Playing peekaboo with Wittgenstein: what do objects do when we’re not looking?

Warning: this film features rapidly flashing images that can be distressing to photosensitive viewers. 

‘What prevents me from supposing that this table either vanishes or alters its shape when no one is observing it, and then when someone looks at it again, changes back? But one feels like saying – who is going to suppose such a thing?’ – Ludwig Wittgenstein in On Certainty (1969)

Inspired by the Austrian philosopher’s posthumously published words above on the limits of human perception to account for the outside world, the UK filmmaker Paul Bush constructed the experimental short Furniture Poetry (1999). The stop-motion animation brings to life a universe where fruits, furniture and tableware shift colour and shape when we’re not looking. The result is a simultaneously jarring and amusing visual poem – a dizzying, madcap meditation on our uncertain reality and the limits of knowledge.