While the frontline members of the cluster focus on building their businesses or conducting their research, the intermediary adds value by tying the threads together.

FORBES: Making it Work: Cluster what?

She campaigned hard in the 1980s to add a building dedicated to dance to the Music Centre's cluster of auditoriums in central Los Angeles, but could not raise the money.

ECONOMIST: Obituary

They endorse rezoning for increased density permitting, in particular, a cluster of five to six buildings, 700 to 900 feet tall (the Chrysler Building is 1, 046 feet), west of Grand Central around Vanderbilt Avenue, with slightly smaller towers marching up Park.

WSJ: Not Visionary Enough | By Julie V. Iovine