When: Wednesdays-Fridays, 8 p.m., Sat., Jan. 21, 8 p.m., Sundays, 2 & 7 p.m., Tue., Jan. 24, 7 p.m., Saturdays, 4 & 8 p.m. and Tue., Jan. 31, 8 p.m. Continues through Feb. 5 2017

Noted musical philosopher Haddaway had a minor but contagious hit single with his ruminations on love and what it is, but playwright Nick Payne frames the many possibilities of human romantic relationships through a prism of theoretical physics and its conception of the multiverse. Marianne, a physicist, meets Roland, a more regular sort, at a party; there is an undeniable spark between them. In one universe, the two pursue the relationship after the party breaks up. In a parallel universe, they don't. All of the possible permutations of their relationship (potential and real) lead somewhere, and all of these outcomes are contained within Constellations. The Repertory Theatre of St. Louis presents Constellations Tuesday through Sunday (January 20 to February 5) at the Loretto-Hilton Center (130 Edgar Road; Tickets are $43.50 to $67.50.

Paul Friswold

Price: $43.50-$67.50