More than 2 million Legos have been piled onto tables at the elevated park near the West 30th Street entrance, and they're ready for construction, organizers said.
In addition to the public, Eliasson enlisted ten architecture firms building projects near the High Line to build their own Lego buildings using a limited number of blocks.
The interactive exhibit will be open from 10 a.m. to 7 p.m. from May 29 to September 30.
Kumar Atre, 29, an architect at Diller Scofidio + Renfro, said building with the children's blocks was a challenge.
"Legos have meant so many things to so many people, but they're also very constricted," Atre said.
His firm held a studio-wide ideas competition for the project, and came up with a simple-looking cube that contains a complicated "multiverse" inside.
Children under 4 are not permitted because of a choking hazard. Admission is free.