Work on the World Trade Center Transportation Hub has finally moved above ground, offering the public a glimpse at the grand design soon to be finished.
But after Christianity was legalized in 313 AD, funerals moved above ground, and by the 5th Century, the use of catacombs as grave sites dwindled, though they were still revered as sacred sites where pilgrims would come to worship.
Such a design calls for utilities to be submerged and for transportation to move above ground level.
As a result, many formerly illegal scalpers moved above ground, becoming licensed brokers who have to pay a $5000 annual fee to the state and abide by certain guidelines, including disclosing sales to the state regulator and offering insurance against fake tickets.
For example, once parasitized, females might spend less time moving around above ground in search of food or mates, which could make them less likely to be collected using a visual search method.
When Hurricane Irma hit southwest Florida last year, in one private burial ground wind splintered many of the trees and water from the flooded Orange River moved some above-ground burial vaults off their foundations.
And while the tax incentives might not matter to young artists just starting out, he said, "for people who want to move from underground to above ground, these incentives do make a difference".
By the early 1980s, technology had advanced so much that the tunnels' telephone center became obsolete, and BT's technicians moved back above ground.
Many animals also move freely above ground in all three dimensions, either by swimming, flying or gliding, or else by climbing through lattice structures such as trees.
