To build a folly is essentially to do something a second time, something at an inopportune moment. That something is always the memory of something forgotten, about which we can paradoxically say "There it is again."
Follies were misunderstood, purposeless constructions. They were often only small, extravagant gestures in a garden, easily whisking off the imagination to distant lands, a sort of time capsule built to awaken the memory and induce surprise in passers-by. They marked locations, organized secondary paths in a park, or simply predicted the arrival of better times—a demarcation, a sacred spot, a mysterious trail, a hill whose tragic rocky nature begged for a tower, a party, or the arrival of summer.
“It is demonstrably true that things cannot be other than as they are. For, everything having been made for a purpose, everything is necessarily for the best purpose.” — Professor Pangloss
"Because this is a garden where things can be left out at night without being stolen, we're going to 'furnish' the garden with French café chairs that won't be secured in the ground, so people can move them to wherever they want to sit...It's like with the chairs being totally casual and relaxed and comfortable. They set a tone. There's things that you have to do to get the right feel, where it's all already there, but then, you know, 'Bing!' – there's a moment of recognition." The patterning of chairs pulled together in different ways by successive waves of visitors over the course of the day becomes an index of the shifting patterns of people that sit in a variety of arrangements to facilitate conversations and other intersubjective alignments, or simply to allow for a moment of private contemplation free from contact with others.