An Italian man was viewing artist Anish Kapoor's work in a museum in Porto, Portugal, on August 13 when he accidentally descended into Descent Into Limbo, an art installation that is a pit painted black.
The 1992 artwork is a cube-shaped building containing a dark hole in the floor.
Pereira said the visitor had been taken to a nearby hospital and was getting better.
The "dizzying experience" of peering down into an "endless chasm in space" made a visitor to Portugal's Serralves Museum of Contemporary Art especially woozy, reports Artnet, and now the 60-year-old man is recuperating from his injuries.
The exhibit is surrounded by caution signs, as well as patrolled by a staff member to ensure safety. The installation has now been closed as it has "suffered" some damage.
The accident was first reported by the local newspaper Publico, which said it happened on Monday 13 August and involved an Italian man in his 60s.
He is the artist behind the iconic work "Cloud Gate", also known as "the bean", in Chicago's Millennium Park.
In order to give the illusion of a bottomless void the sides of the hole are coated in black pigment, which gives the hole a much more menacing and infinite feel to it - luckily for the man that fell, it wasn't infinite, but a not-too-nice 2.5m (8.2ft) fall. Just a scant 0.035 per cent of visible light is reflected by an object covered in Vantablack, making it impossible to see any curves or contours - or to accurately gauge the depth of a hole if you don't know what you're looking at.
Kapoor's Descent into Limbo is literally a hole in the ground, which resembles a giant ink blot on the floor to the naked eye.