Altar is the table in the sanctuary where the Sacrifice of the Mass is offered. Take a closer look at the protruding line a little lower from the edges of the table.
Rostrum is the platform where the Scriptures are read and the homilies delivered. Take a look at the same motif of the protrusion.
Tabernacle is the safe where Consecrated Host is stored. Look at the protrusion that follows the form of the built-in stand -- now a clear semi-Masonic insignia.
