Cheap laser show (sorta)

glass can be really tricky. Depending on the properties of the glass your using alot of times you will make something amazing only to find it full of hairline cracks of shattering as it cools. Even if you keep it even during heating the areas you deform will cool different than the areas surrounding.

If you want glass, just go to a glass shop and a get a little scrap from several kind of
textured "privacy" glass they use on showers and some doors.

^^good advice there..