The window is reflected in the showcase and also on the glass floor.
In the display case are Roman roof tiles stamped LXFRE.
The tiles and many other ceramic elements were manufactured here, under the floor of the Jerusalem convention center, in a Roman kiln, some 1,900 years ago.
LXFRE stands for Legio X Frentensis, the famous Tenth Legion of the Roman Empire.
The kilns were discovered I think in the 1950s, when the foundations were being dug for the huge Binyanei HaUma convention hall.
Two of the kilns were left in situ and the building was built over them.
Sometimes (rarely), the basement room is unlocked and you can go in and observe the antiquities up close instead of through glass.
See a Roman soldier's sandal print in one tile in an earlier post and in this one too.
(Linking to Weekend Reflections and Whimsical Windows, Delirious Doors.)