The shape of the wine glass is important for tasting wine
Knowing this, it is much easier to understand the three main factors in the design of a wine glass. The shape of the wall determines how the wine and aroma flow to the mouth. The size of the mouth affects the flow rate of the liquor and the taste area of the tongue.
A wine glass with a conical edge is designed to draw the wine towards the centre of the tongue, rather than to the acid sensitive sides. There are even theories that special designs can enhance or diminish the sense of smell by changing the Angle at which you tilt your head when drinking.