Conversation so far:
What is Lawn Boy in relation to Phish?
Lawn Boy is the second studio album by the American rock band Phish.
What is Nectar in relation to Phish?
Nector Rorris was the owner of the venue where Phish played their first live gig and namesake for the album A Picture of Nectar.
How did Phish's A Picture of Nectar album do?
Phish's album A Picture of Nectar was certified gold by the RIAA on November 15, 2001.
Did Phish tour during A Picture of Nectar's album release?
During the summer of 1992, Phish toured Europe with the Violent Femmes and later toured Europe and the U.S. with Santana.
Are there any other interesting aspects about Phish between 1990 - 1992 besides the albums they released?
By late 1990, Phish's concerts were becoming more and more intricate, often making a consistent effort to involve the audience in the performance.
What made Phish intricate in live shows?
In a special secret language the audience would react in a certain manner based on a particular musical cue from Phish as part of intricate live performances.

Question: What is an example of the audience participation?
Self-contained rewrite: What is an example of the audience participation at Phish live shows?