The first thing to know about Marcel + The Art of Laughter is that they are two one-acts, not a single show. The first is named for one of the two performers in it: Marcello Magni—although using the French version of Marcello conveniently echoes the great mime Marcel Marceau. The second is a solo performance by Marcel’s compatriot in the first piece (and co-creator of it) Jos Houben, a Belgian. Their show is about clowning and laughter, and it has a particular European sensibility that’s engaging, offbeat and sometimes strangely familiar.