His best works have always required a second or third glance, which is, not coincidentally, the point about much of what he photographs.

An inscription reports that these works required the labor of 802,366 craftsmen.

Sometimes the group augments their numbers when certain musical works require a greater number of voices.

Other works of New Media art require audience members to interact with the work but not to participate in its production.

The works of Andijewska are complex and require erudition from the reader.

But his largest works, which were 29 inches high and held up to 40 gallons, must have required awesome strength.

Its works requires a replacement station to be built on a new viaduct nearby.

All three works require virtuosity and cooperation with the orchestra.

Almost every civil works project requires a federal environmental impact statement soliciting comments from government agencies and the public.

Simply put, the works in the show require some audience participation.