Follow the Tube

There are dozens of pneumatic tubes criss-crossing the ceiling.  Figuring this place used to be a bank, you decide to follow one to see where it leads.  It takes you a while, tracing pipes this way and that, but finally it leads you to a termination in the wall.  The tube goes through, but there is no doorway for you to pass through after it.

There are eyeballs in jars all over the room.

Press around on stuff on the wall until something happens.

Investigate the eyeballs.