Light where horses race

Back at the Yorkshire Sculpture Park again for my Day Off last week, we hugely enjoyed the Tony Cragg pieces (top two pictures) but were most fearfully engaged by Alfredo Jaar's work most of which was under a 'no photographs' embargo but which also included his The Garden of Good and Evil (bottom two photographs) which expresses the hidden places of detention in the world.  

He quoted Mahmoud Darwish, a Palestinian poet already important to us: I love the particles of sky that slip through the skylight - a metre of light where horses race.  I was obviously put in mind of Oscar Wilde's little tent of blue which prisoners call the sky - but also taken back to Irina Ratushinskaya's frosted window and Anne Frank's horse-chestnut tree.