This week’s whichWMATA, the fortieth, had a theme: All of the stations have shapes in their names. How well did you do?

We got 28 guesses this week. Four of you got all five. Great work, Peter K, Rich Frangiamore, FN, and Mr. Johnson! Joey and Chris H also correctly identified the theme, but didn’t get all five correct.

Image 1: Dupont Circle

Of Metro’s 91 stations, eight have shapes in their names. There’s one circle, one triangle, four squares, and two pentagons. I also tried to take photos that featured geometric shapes as well.

The first picture shows the broad bowl that’s home to the northern (Q Street) escalators at Dupont Circle station. The circular rim and pit is itself unique within the Metro system. But another distinguishing feature is the inscription around the rim, which Metro installed in 2007. The words are an excerpt from Walt Whitman’s poem The Wound Dresser. Every person got this one right, all 28 of you. Great work!

Image 2: Federal Triangle

The next image shows the street escalators at Federal Triangle. Several of you confused this with Union Station, but this entrance is significantly different. For one, there are three side-by-side escalators here. Union Station has just two, and they’re separated. Additionally, at Union Station, the escalators face the wall of the station, not the exterior. In this case, the light is streaming in from the courtyard (opposite 12th Street). Just over half of you — 16 — guessed correctly.

Image 3: Mount Vernon Square

When I went to Mount Vernon Square last week to collect pictures for this series, I didn’t intend to capture this angle, which is directly above the street escalators and stair. But the sharp triangle fit with the set so well, I couldn’t not snap a shot. The superstructure is part of the Convention Center, and stands over the entrance on the southwest corner of 7th and M Streets NW.

I expected this one to be a stretch, but if you’d sussed out the theme you should have been able to narrow this down to one of four stations. This was the hardest of the set, garnering only five correct answers. Two people guessed a different “square” station.

Image 4: Virginia Square

The fourth image is another square. It’s Virginia Square, to be precise, which heretofore was the only station in Virginia we hadn’t featured. If you had figured out the theme, you probably knew that the building at left doesn’t fit around any of the DC “square” stations, and this is the only “square” outside of the District. It’s clearly a residential building (with balconies) and is of the style typical of the Rosslyn-Ballston Corridor.

The other icon is the clock tower visible through the escalator canopy, which a surprising number of you seemed to recognize on its own. Sixteen people knew this was Virginia Square.

Image 5: Pentagon City

The final image shows an unused entrance to Pentagon City. When the station was built, in addition to the entrances on either side of Hayes Street south of 12th Street (and a direct entrance into the mall), a tunnel ran over to the northeast corner. At some point, however, that tunnel closed. But the entrance is behind a set of glass doors immediately opposite the faregates. There are four porthole-shaped windows along the passage, which are the subject of this photo.

In keeping with the theme, they’re also a geometric shape. They’re the only real clue to this image, but they’re a very distinct and easily-visible feature of Pentagon City station since they’re straight ahead as you exit the faregates. Nine of you figured this one out.

I expected many people to get Dupont Circle, Federal Triangle, and Pentagon City, since those stations are well-used and fairly distinct. I hoped that knowing there was a theme would help people figure out the two “square” stations.

Thanks to everyone for playing! Great work. Stay tuned. We’ll have five more images for you next Tuesday.

Matt Johnson has lived in the Washington area since 2007. He has a Master’s in Planning from the University of Maryland and a BS in Public Policy from Georgia Tech. He lives in Dupont Circle. He’s a member of the American Institute of Certified Planners, and is an employee of the Montgomery County Department of Transportation. His views are his own and do not represent those of his employer.