A new theoretical approach to fluid turbulence came from Steven A. Orszag of Princeton University who also showed his audience a slide depicting a newspaper advertisement for the Off Broadway play "A Girl's Guide to Chaos," described as a belly full of laughs and a glorious gigglefest.

Typically, a "slide library" contains slides depicting artwork, architecture, and cultural objects, and is typically used for the study, teaching, and documentation of art history, architectural history, and visual culture.

Mr. Reagan then showed a slide depicting himself and his wife in an attitude of shock and horror, and the President said, "Here Nancy and I are listening to one of his speeches."

Legislators were treated to a PowerPoint presentation in which Mr. Bloomberg showed slides depicting a dire future of street traffic and overloaded subways, and he asked for new daytime fees for driving in much of Manhattan, new subway construction and other measures.

At one talk at the festival, a conservationist put up a slide depicting the annihilated "range of the ivory-bill."

To illustrate the seemingly improbable fact in this era of media oversaturation that "certain respondents in the sample were not exposed to any outdoor signs," Ms. Hadfield showed a slide depicting the commuting route of one of the few such participants.

"We're creating our own world, sharing our combined experiences and visions with everyone," said Yana Elabd, an architect and film set designer who created the bathtub installation, as she stood near a slide depicting a giant frog.

Even the graphics used to illustrate "The Origin of Love" are similar: onstage, slides depicting primitive figures were projected on the wall behind the actors; in the film, a cartoon by Emily Hubley accompanies Mr. Mitchell's voiceover.

Subcommittee chair Stupak then showed a slide depicting dead rodents, feathers, and other debris near the plant air intakes system.

ABC ended their broadcast of the race with a slide depicting Wheldon in black and white, and the text "Dan Wheldon, 1978 - 2011" before fading out.