The second law of thermodynamics and the first law of Nelly lyrics hold that ambient heat and clothing have an inverse relationship. Disturb the natural order with today's Groupon: for $25, you get $50 worth of apparel, accessories, and more at Atticus, on Carroll Street downtown. This Groupon is good for in-store purchases only.

Atticus, a designer boutique, lines its fashion-forward racks with distinctly original apparel that can become the building blocks of a timelessly savvy wardrobe. Many of its labels are exclusive (you can't get them at another store or beneath an overturned canoe), and many are eco-friendly (made with sustainable materials or manufactured responsibly). Women can soak up the late summer sun with Loomstate dolphin T-shirts ($62) or prep for the leaves to quit the trees with Plush fleece-lined arm warmers ($35). Gents can garb in Friend or Foe vinyl T-shirts ($45) or sufficiently sophisticated Steven Alan skinny ties ($60). Beyond fashionable fabric, Atticus offers premium body products such as a Leila Lou fragrance ($38) for her and Malin+Goetz geranium body wash ($18) for him.

Atticus's staff members are well-versed in the shop's selection, so they're happy to tell you tales of a particular brand's origin or ability to absorb forms of kinetic energy. Curious clothing connoisseurs can peruse Atticus's Lookbooks online or just stop by the store for inspiration and the chance to mistake their own reflections for rogue runway models.