1. Al Hansen
At Andrea Rosen; 525 W. 24th St., nr. Tenth Ave.; 212-627-5450
Funky, Fluxus-era works made from Hershey wrappers, cigarette butts, and other detritus.
2. Tim Lee
At Cohan and Leslie; 138 Tenth Ave., nr. 19th St.; 212-206-8710
Videos that skillfully reference Bruce Nauman and Public Enemy, among others.
3. “Fallout: Cold War Culture”
At Mitchell-Innes & Nash, 534 W. 26th St., nr. Tenth Ave.; 212-744-7400
Art about espionage, surveillance, and rumor (including new work by Sam Durant and Adam McEwen).