It’s not as immersive as New York’s The Gates, 2005, nor as magnificent as Floating Piers, 2016, in Italy’s Lake Iseo – it has also, according to Hyde Park regular Kay, “scared away the ducks,” – but superstar artist Christo’s The London Mastaba looks quite absurdly unreal and is totally free for the public.

Not far into Aftermath, Tate Britain’s new exhibition looking at how the experience of World War One shaped artists working in its wake, hangs a group of photographs by Pierre Anthony-Thouret depicting the damage inflicted on Reims.

This weekend the Royal Academy (R.A) celebrates its 250th anniversary with the opening of 6 Burlington Gardens (main picture), duly refurbished for the occasion. When it was dirty the Palladian facade felt coldly overbearing, but cleaning it has highlighted the bands of sandstone and brown marble columns that lend warmth to the Portland stone. Originally built in the garden of Burlington House as the HQ for the University of London, this Victorian edifice turns out to be rather handsome. 

In bronze, marble, stone and plaster, as far as the eye can see, powerful figures and fragments – divine and human, mythological and real; athletes, soldiers and horses alongside otherworldly creatures like Centaurs – stride out. They pose, re-pose, twist, turn and captivate as that 19th century sculptor of genius, Auguste Rodin (1840-1917), encountered and absorbed, with such sensual pleasure, the art of antiquity.

Sexy is an overused word in the arts but it’s an adjective you can’t help applying to some of Helaine Blumenfeld’s voluptuous marble sculptures as you run your fingers over their surfaces. These abstract bodily forms, often in the purest icing-white crystalline stone, are so tempting that you almost want to lick them. Licking is not actively encouraged but Blumenfeld is very keen that you touch and feel the surface of the work.

Fifteen years ago on a cold grey Saturday in mid-February, Trafalgar Square was filled with people marching to Hyde Park in opposition to the proposed invasion of Iraq. A million people gathered in London. Three times that number turned out in Rome. That day, across Europe and the rest of the world, between six to eleven million people participated in the largest coordinated anti-war rally in history.

Modigliani was an addict. Booze, fags, absinthe, hash, cocaine, women. He lived fast, died young, cherished an idea of what an artist should be and pursued it to his death. His nickname, Modi, played on the idea of the artiste maudit – the figure of the artist as wretched, damned.

Our universe seems to be in a state of equilibrium, neither collapsing in on itself nor expanding ad infinitum. The metaphor used by physicists to represent the delicate balance of forces needed to maintain this happy state of affairs is a pencil standing on its tip. In his sculpture Omega = 1, Steven Pippin miraculously turns the metaphor into physical reality.

The best way to see Marc Quinn’s exhibition at Sir John Soane's Museum is to begin at the end, in a room explaining the process of casting the sculptures’ moulds from the entwined bodies of him and his partner, dancer Jenny Bastet.

The gallery walls of Tate Britain have been taken down so turning a warren of interlinking rooms into a large, uncluttered space in which Rachel Whiteread’s sculptures are arranged as a single installation. What a challenge! And curators Ann Gallagher and Linsey Young are to be congratulated for pulling off this difficult feat so seamlessly.