The thing to remember, Hansen Mulford tells me, is that I'm not looking at an object. "You're really looking at light," he says as the gallery's sharply focused beams glint off the crystal-clear frames of his glasses. Mulford, longtime curator of the Orlando Museum of Art, is showing me around the museum's current art glass exhibition, and we're discussing the properties of glass, perhaps one of the most difficult and dynamic materials an artist can work with – the way it refracts and reflects light, its fragility, the sheer danger of working with the molten or shattering stuff.

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