To some degree this is art for the feet. Serraâ€™s eight sculptures invite you to walk them in sequence. In fact they demand it. How else will you get to see them?
Thus it takes half an hour to simply cover the ground of this semi-permanent show in the Arcelor-Mittal Gallery here at the Guggenheim in Bilbao.
It is a large space and the sculptures make it even larger. You trace a path through spirals which appear larger inside than out. You encounter barriers dividing the room.
All the while, at some atavistic level, you experience fear that one of these forged steel slabs will lean too far in and crush you. Or you experience this as thrill.
Rusty steel may not be the most eye-catching of materials. But it is hard to imagine more of a spectacle in any gallery than this biggest-ever group of Serra works.
Those who believe artists must work hard at feats beyond the range of â€œmy three year old,â€ should be well pleased with this piece of monumental maze-making.
It weighs about 1,000 tons. Individual pieces have been engineered to the nearest tenth of a millimetre. Their journey from a German forge to the Basque region was epic.
It is fitting that this gravity-deying consignment came by boat. Serra recounts how as a boy he was taken to witness the launch of a tanker ship in Brooklyn.
After it slipped down the launch, the watching crowd held its breath as this vessel first sank and then rose to a state of sea-worthy floatation.
â€œAll the raw material that I needed is contained in that memory,â€ the artist has said. It is a great story and indeed floating ships and flying planes should fascinate sculptors.
Visitors to The Matter of Time have two ways of approach this work. They can lose themselves on ground level or take an aerial view from a balcony on level one.
If anything, the balcony makes Serraâ€™s gallery look even more precarious. To enjoy this takes a measure of faith. And so the material gives rise to the immaterial.
Perhaps that is the real effect of time on matter: some manner of transcendence, as the 25-year exhibition slowly turns amber with rust and we ourselves go grey.
These works can be seen at the Guggenheim, Bilbao. Check gallery website for more details.