(1991), was a billboard installed in twenty-four locations throughout New York City of a monochrome photograph of an unoccupied bed, made after the death of his long-time partner, Ross Laycock, from AIDS. In one interview, he said "When people ask me, 'Who is your public?' I say honestly, without skipping a beat, 'Ross'. The public was Ross. The rest of the people just come to the work." "Untitled" (It's Just a Matter of Time) is a billboard originally exhibited in 1992 in Hamburg in conjunction with an exhibition organized by the Kunstverein in Hamburg titled "Gegendarstellung - Ethics/Aesthetics in Times of AIDS". It consists of a black background with white German text in Gothic typeface. In 1993, González-Torres mounted two simultaneous gallery exhibitions in Paris entitled Travel #1 and Travel #2: Travel #1 contained two billboards both installed inside the gallery, one featuring a view of a turbulent and brooding sky, the other an image of lone bird, photographed from below, floating effortlessly beneath an overcast sky; one of several works in "Travel #2" was "Untitled" (Passport #11), a stack of passport sized booklets featuring the same imagery as the billboards in Travel #1. Like his other stack pieces, viewers were invited to help themselves. In 1989 González-Torres presented "Untitled" (Memorial Day Weekend) and "Untitled" (Veterans Day Sale), exhibited together as "Untitled" (Monuments): block-like stacks of paper printed with content related to his private life, from which the viewer is invited to take a sheet. Rather than constituting a solid, immovable monument, the stacks can be dispersed, depleted, and renewed over time. "Untitled" (1991), however, is a unique stack of 161 signed and numbered silkscreens that remain together. Similar to the 1989 billboard commemorating the 20th anniversary of the Stonewall Rebellion, its iteration as a stack of prints was meant, as the artist noted at the time, as a "more private and personal object"—one that is not disseminated physically but instead through the experience of remembering. The stark black page and white typeface on each sheet trace a nonlinear chronology of significant events in the history of the gay-rights movement. In addition to his signature "candy spill" and "stacks", González-Torres created other variable works referred to as "lightstrings", which consist of low-watt light bulbs on cords hung on the wall or piled on floor. Twenty-four nearly identical lightstrings exist, differentiated only by their parenthetical titles and the display chosen by