If you stand ...

[muninnhuginn]

... in the Hayward Gallery on the far side of Hatch and peer through exactly the right endoscopic tube, providing one of the current pair of indwellers doesn't block the way, you can see through its entrance on the opposite side, through the doorways into and out of Drawn, through the gallery, out across the sculpture terrace to one of the watchers of Event Horizon neatly framed in the square of the peephole.

Glorious serendipitous magic.

Thank you Antony Gormley.