Glass fusing, also called lamination is 
when two or more pieces 
of glass are fired together 
at 835C in a special kiln.
Glass in different colours 
can be used together, 
each 1 or 3 mm thick. Stringers,crushed glass and
glass powder are used for the design. 
The finished result is a thick
glass plate. 
In a second firing, at 725 C,
the plate is put into a mould 
of ceramics
or steel, to be bent and shaped into the desired shape.  
This is called Slumping.
Here you can see glass platters to be slumped.