HELP IDENTIFY an unusual piece of glass

HELLO ALL AGAIN...Just want to say that you have an exceptional group of people here.
This glass pitcher is hand blown..the base is applied to the bowl and it sits on an angle..does not show well in the photos but the stem is crooked too ..the top is yellow but what's unusual is when I put UV to the top the bowl blows up a bright orange but when its put to the side it does nothing as seen in the last photo..thanks in advance for your help on this one..Andy

 

UV reaction is to cadmium, can't explain why not on the side, thuogh.

 

Perhaps 2 layers of glass (cased - in a sense) inner layer is UV reactive, outer layer somehow blocking UV. - A theory based on - observation

 

its almost like fiber optics..from the top it blows up..but also when I hold it underneath a red ring appears...very strange...I added a photo

 

also its not thick like cased glass..its on the thin side..ive been scratching my head for a pretty long time with this one...thanks for all your help..Andy

 

THANKS ALL IT WAS A GOOD TRY