The shape of a wineglass can have a subtle impact on the perception of wine, especially its bouquet. Typically, the ideal shape is considered to be wider toward the bottom, with a narrower aperture at the top (‘egg’, or perhaps, ‘beaker’ shaped). ‘Tulip’-shaped glasses, which are widest at the top are considered the least ideal. Many wine tastings use ISO XL5 glasses, which are ‘egg’-shaped. Interestingly, the effect of glass shape does not appear to be related to whether the glass is pleasing to look at.