A museum visitor descended 8 feet into Anish Kapoor's Descent Into Limbo installation in Portugal last week.

The injured Italian museum-goer possibly did not see the warning signs around the installation, which was not roped off at the exhibit in Serralves Museum in Porto. Painted black, Descent Into Limbo is a circle that appears to have no depth, but is actually an eight-foot hole.

Known for sculptural works like Chicago's Cloud Gate (the Bean), Kapoor also made headlines after securing the artistic rights to the pigment Vantablack, the darkest of dark shades that reflects just 0.035 percent of visible light. Descent Into Limbo (1992) was created before Vantablack was announced, but seems to have a similar "black-hole" effect. 

Part of the “Anish Kapoor: Works, Thoughts, Experiments” exhibition, the installation is described as “an expression of Kapoor’s interests in the formal and metaphoric play between light and darkness, inside and outside, the contained and the infinite, which underpins his sculptural oeuvre.”