A lovely piece.
I build or alter each mold depending on the moment - but it's the weight of the two thick layers of re-purposed glass along with the texture that gives it a special "hand". 
 
Custom mold
Up-cycled glass from a cabin on Tahoe's North Shore.
Oxides and enamels
 
This piece can be seen at The Piper J Gallery in downtown Truckee, Ca