Leonardo da Vinci drew this study for the angel in the “Virgin of the Rocks” around 1483–85.

Sean Collier’s 2-year-old cousin crouches by the new memorial following Wednesday’s dedication. The ceremony was attended by hundreds of people, including students, MIT President L. Rafael Reif, and police officers from nearby towns.

Raf Simons is the creative director at Dior.

Blake Lively and Michiel Huisman star as Adaline Bowman and Ellis Jones in The Age of Adaline.

Daniel Rothenberg G runs the Boston Marathon.

On Friday night, students participated in the Dandelion Project, a collective artwork on Kresge lawn. Each participant wrote a wish on a card and hung it up inside a large round tent. At the center of the tent was a “dandelion” made of fiberoptic sticks. Each participant added a new stick to the dandelion. The project was hosted by the MIT 2015 Class Council, MIT STEAM, and Pneuhaus.

Team “COME TO PRIMAL” (from left to right: Daniel Dalton ’17, Jake P. Ligouri ’17, Filip Twarowski ’17, and Sean D. Kropp ’17) work with Prof. Mark Drela and one of the pilots to fix their plane prior to the speed mission.

Team “Give Me Some Shouga”’s aircraft leaves the starting line for its first attempt at the payload mission.

Members of the team “Average Joes” (from left to right: Matthew R. Ryback ’17, Eric A. Riehl ’17, Bjarni Kristinsson ’17, and Bradley J. Walcher ’17) look on as their plane completes the payload mission with eight hardboiled eggs.

Members of the team “ProCADinators” (Andrew E. Kurtz ’17, left, and Edward J. Lopez ’17) work to repair their plane for the payload mission after a crash led to a break in the fuselage.

Moritz’s father, played by Garrett W. Schulte ’17, grieves for his son in “Left Behind.”

Students drop a piano from the roof of Baker House in an annual Drop Date celebration.

Salim Akram of Bad Rabbits jams out on the guitar during the opening act.

Team “Egg On”’s plane sits at the starting line of the runway in preparation for the payload mission. For this mission, each plane was given a separate score based on how many hardboiled eggs were intact after a 5-lap flight around the indoor Johnson Track.

Matthew T. Iovino ’17 acts in the MIT Musical Theatre Guild’s production of Spring Awakening. Set in a German town in the late 19th century, the production explores a variety of mature themes born of the characters’ nascent sexual curiosity. Shows continue today, tomorrow, and Saturday at 8 p.m. in Little Kresge.

Lupe Fiasco, the main number at Spring Fest 2015, sings to a cheering audience.

Artist Lupe Fiasco leads the crowd in a dance.

William R. Ruschel ’18 soars above the jumping pit during the New England Women’s and Men’s Athletic Conference championship on Saturday. MIT won the championship for the 15th straight year.

Karen D. Hao ’15 sings with MIT Resonance during Saturday night’s concert.

Wendla (Talia E. Weiss ’17) and Melchior (Matthew T. Iovino ’17) share a moment in a hayloft during “The Guilty Ones.”

Lupe Fiasco leans back while singing with students at SpringFest 2015.

Fredua Boakye of the opening act, Bad Rabbits, sings before a crowd of students.

Students cheer as Lupe Fiasco enters the stage during the 2015 Spring Fest concert.

A Jurassic Park-themed Lobby 7 hack appeared Sunday morning featuring three velociraptors, a banner proclaiming “When Dinos Ruled MIT”, and a giant pterodactyl with a 15-foot wingspan suspended from the dome.

Talia Weiss ’17 as Wendla in “Mama Who Bore Me.”

Benjamin C. Freed ’17 competes in the steeple chase during the New England Women’s and Men’s Athletic Conference championship on Saturday. MIT won the championship for the 15th straight year.

Matthew T. Iovino ’17 as Melchior in “Totally Fucked.”