James Turrell creates a magical, mindful experience out of something so ordinary as daylight. Each of his Skyspaces around the world frames the same thing: the sky. But, of course, the sky is never quite the same. Dawn to sunset, autumn to spring, sunshine to storm – light and shadows constantly shift. Clouds pass over, time moves, and for the moment you're in here, all you can do is look up and watch.

Kimsooja’s elegant tower creates an impression from all perspectives – particularly when the sun beats down on it. At a distance, it’s a radiant beacon on the landscape, casting a dramatic, pointed shadow. Up close, its surface shimmers like a butterfly’s wing. Closer still, a mirror within transports you both down into the earth and up into the sky.

A sculpture with a function. This working sheep fold is a collaboration between the artist and a farmer who uses it to manage their flock in YSP’s Country Park. Within is a slab of stone that, during rain or snow, you’re invited to lie on and leave behind your own ‘shadow.’

Barbara Hepworth was keen for her work to be ‘allowed to breathe’ outdoors. In this way, Square with Two Circles comes alive in large part thanks to the nature that surrounds it on YSP's Hillside. Its circular windows make the landscape and light beyond part of the artwork. Depending on the time of day and year, it casts shadows and reflects sunlight in ever-changing ways.

Inviting yet secretive, this cave-like sculpture echoes some of the historic follies on YSP's grounds, like the Shell Grotto. It changes with the weather – at times radiating sunlight; at others appearing hazy. This mysterious, unpredictable nature is all part of the artwork’s appeal.

Alfredo Jaar's work makes powerful, political statements. Here, his steel cells represent the CIA's secret detention facilities like Guantanamo Bay. Partly obscured by trees and water, they highlight the hidden nature of these sites. Symbolically, they cast a dark shadow on this otherwise peaceful landscape.