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Horvitz invites other friends, artists and curators to produce exhibits, events and readings and collaborate with him, taking a relaxed approach to programming: He intentionally keeps the garden’s programming relatively casual and free form.

“They look like paintings to me. I’ve been drawing them since I was a kid. They’re free form and always flowing, moving. It’s that dream state.”

White ribbons curl across the composition, their free forms in contrast to the tightly overlapping circles produced by a mechanical plotter.

On Sunday, one passenger said Ryanair staff had been warning customers at Hamburg airport after some had paid for the free forms.

“The internet is the only free form of medium which exists against the present political regime,” he added.