Lo-fi sci-fi, hollow metal people and Churchill’s big guns – the week in art

. UK edition

A black cannon on a wooden mount sits on a sandy beach at Walmer with people in the water and cloudy sky beyond. A painting by Sir Winston Churchill, The Beach at Walmer, 1938.
We shall paint on the beaches … The Beach at Walmer by Winston Churchill, 1938. Photograph: © Churchill Heritage Ltd.

First major retrospective for the wartime PM’s paintings, shadows of Berlin Dada, hopeful science and the outrageous art of Valie Export

Exhibition of the week

Winston Churchill: The Painter
Britain’s eloquent war leader kept himself sane by puffing on cigars, swilling brandy – and painting the world around him.
The Wallace Collection, London, from 23 May to 29 November

Also showing

Kira Freije
There are shadows of Berlin Dada in the hollow metal people created by this Turner-shortlisted artist.
Modern Art Oxford from 23 May to 16 August

Miriam Elia
An artist known for her witty take on Ladybird books turns her eye towards Moses in this exhibition for Jewish Cultural Month.
JW3, London, until 30 June

Liam Young
Futuristic but lo-fi worlds you can walk through, in a series of installations finding hope for our planet.
Barbican, London, until 6 September

Zsuzsi Ujj
First UK solo show for this cult figure in Hungary’s dissident art and underground music scenes.
Arcadia Missa, London, from 22 May until 18 July

Image of the week

Tapp und Tastkino (Tap and Touch Cinema) was a typically provocative but playful 1968 performance piece by the fearless Austrian feminist artist and film-maker Valie Export, who died this week. Subverting beauty standards on the silver screen, her cinema gave people the opportunity to interact with and appraise a real female body: her own. We reported on Export’s life and work in this news story and asked other artists, including Peaches, Florentina Holzinger and Joan Jonas, what her example has meant to them.

What we learned

Taiba Akhuetie makes wild creations out of hair – Rihanna and Cate Blanchett are fans

Whistler should have used better paint to capture his mother

Nina Simone’s chewing gum is going on show in a new exhibition celebrating the superfan

Christo made the invisible visible

Grayson Perry’s life story is to be made into a musical

Naked jetskiers, human bells and urine divers – Florentina Holzinger rocked this year’s Venice Biennale

Gen Z can’t get enough of the king of colour, Mark Rothko

Sanya Kantarovsky’s paintings of Christian iconography and children will haunt you

Masterpiece of the week

The Judgement of Paris by Joachim Wtewael, 1615

Don’t dare to judge the gods; the loser won’t take it lying down. Here, the Trojan prince Paris is foolish enough to rate the beauty of Minerva, the goddess of wisdom, Venus, goddess of love, and Juno, the wife of the king of the gods and a cosmic power in her own right. He gives the prize to Venus in return for her helping him seduce the legendary beauty Helen, wife of a Greek king. Out of this moment the Trojan War began, with the Greeks supported by the furious Juno. For a 17th-century artist there is terrible piquancy here. War devastated Europe in the 1600s, from the struggle between Wtewael’s Holland and the Spanish empire to the 30 years’ war that would soon devastate central Europe. Perhaps that is why this painting feels so edgy and unrelaxed. Wtewael’s bony, angular style, which prefers wilful, exciting distortions to conventional beauty or harmony, is known as mannerism. Here, he fills a woodland with rich, eye-catching flowers, feathers and feasting – yet there’s an overabundance to it all that presages doom.
National Gallery, London

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