The light in these pics may be a bit wonky, but hey. The Kendall/MIT subway station has several interesting murals along its walls, as well as mechanical devices that allow you to make funky sounds while you wait for the train (well, when the devices are working, that is.) One of the longer murals you can view is a year-by-year history of MIT, done up like the Periodic Table of the Elements. Kinda neat.
The other murals in the station are high-contrast photo murals showing the kinds of scientific stuff people can do at MIT. Or, rather, there are high-contrast photo murals showing the kinds of scientific stuff people were doing in MIT during the early 1980s, which was when this station was renovated, redesigned and redecorated. Take, for example, this mural.
Why, this one shows a bunch of students on the right intently studying the rib section of a skeleton. Interesting, okay, but what's that behind the fellow in the back?
COOLEST. HIDDEN SKULL. EVER.
And now, much like how those who know the existence of the FedEx Arrow can never look at the logo the same way again, you will always see the skull when you ride into Kendall Station. The mural is at the very far end of the outbound platform and, quite possibly, on the other side of the station at the very far end of the inbound platform too, but I don't know. I just know outbound.