When I was first commissioned by the Orchestra of the Age of Enlightenment I never dreamed that it would turn into a marriage of such long duration. The length and breadth of the collaboration has lasted over 20 years now, and long may it continue. It has afforded me the opportunity to get to know many of the players, which as time passes allows for an intimacy and trust that's very rare in photography, a profession which, like the proverbial shark, requires constant forward movement.

Arts festivals the size of the Venice Biennale are inevitably patchy. The appointed directors are hardly ever given enough time to curate and fill absolutely vast volumes of space. They can exhort the many national and individual participants to follow their lead, and yet they have no editorial control over them. And so for this year’s architecture biennale, with its theme of social responsibility – Reporting from the Front – set by director Alejandro Aravena, consider the newly-built Australian pavilion. This proudly features a swimming pool.

In a gallery darkened to evoke the seabed that was its resting place for over a thousand years, the colossal figure of Hapy, the Egyptian god of the Nile flood, greets visitors just as it met sailors entering the busy trading port of Thonis-Heracleion some 2,000 years ago. One of the largest objects ever loaned to the British Museum, Hapy symbolises the prosperity bestowed upon Egypt by the river Nile, but whose waters ultimately brought about the destruction of the ancient cities of Canopus and Thonis-Heracleion, which subsided into the sea in the 8th century AD.

Asking theartsdesk's theatre photographer to review Photo London is like asking a car mechanic to review the London Motor Show. "Remember the big picture!" I kept telling myself as I tried to deconstruct the lighting of a particular shot or measure the depth of field.

It is an inspired pairing: iconic images by the American photographer Richard Avedon (1923-2004) and the painter, printmaker and filmmaker Andy Warhol (1928-1987), almost all of whose mature work was based on the photographic image. They are together in a large exhibition at Gagosian, Britannia Street, itself one of the largest and most elegant commercial art spaces in London, designed by that cultural architectural duo Caruso St John.

To liberate traffic-choked city streets for pedestrians, to suspend phantasmagorical, literally high art above their heads and give a sense that London belongs to them: that’s an admirable vision, surely. Artichoke has been wowing the crowds since it brought Royal de Luxe’s The Sultan’s Elephant to town in 2006. Its festivals of light have drawn crowds and prestige to Durham in three alternate years, and to Derry-Londonderry. Could Lumiere work in as diffuse a city as London?

Can a portrait really be a portrait if we can’t see a person’s face? And what if the reason we can’t see their face is that it is covered with a lump of dough? Is it a joke? And if it is a joke, is it on us or them? Or perhaps it is a joke about art itself: doughy masks aside, Dahlgaard’s portraits are in every other way conventional, and dough is not so dissimilar to clay, a venerable material in the history of art.

This is difficult. An official obituary, such as the one I’ve just finished for The Guardian, has no problem in pointing out the achievements of Kurt Masur’s distinguished career. Whatever his party-line status in Honecker’s East Germany, which he used to get the Leipzig Gewandhaus rebuilt to his own satisfaction, Masur did play a crucial role as one of five spokesmen preventing a Tiananmen Square-style massacre before the Berlin Wall fell.

Walls that are floors, floors that are walls, and stairs that go up to go down: in the brain-befuddling art of MC Escher (1898-1972) the mundane everyday meets a world of paradox in which the rules of gravity, space and material reality are thrown into disarray. From his fantastical architectural spaces with flights of stairs that lead nowhere, to dazzling tessellations that fade into infinity, Escher is synonymous with queasy optical illusions that fascinate and nauseate in equal measure.

Arena is the longest-running arts documentary programme for television at the BBC, and perhaps the world: as the BBC itself phrases it, this compendium celebration presented 24 hours in 90 minutes for 40 years, marking the show's latest anniversary. Conceived by the ever-creative and energetic Humphrey Burton all that while ago, Arena has made over 600 films, looking at high and low culture with equal curiosity, alacrity and even audacity.