Background: It is frequently claimed that the glass shape has a direct impact on wine aroma. Methods, Patients: Healthy Volunteers (43 m, 46 f, age 19 - 60 years) tried 3 glasses. Three glasses of different shape but of the same height and of comparable opening diameter were used. Glasses were of "tulip"-like, "beaker"-like, and "egg"-like shapes. Intensity, hedonic tone, and quality of a red wine were rated before and after drinking. Results: Both intensity and hedonic ratings of wines from different glasses were influenced by glass shape. Class shape also influenced the complexity of wine odors. This appeared not to be related to the esthetic impression the glasses made. Conclusions: The present data indicate that egg-shaped glasses, compared to "tulip" or "beaker" glasses, appear to produce higher intensity and higher complexity of wine odors. This may relate to the trapping of odors in egg-shaped glasses.