I liked these mugs so I decided to buy them. I didn't think it appropriate to use these to serve coffee to my guests so I bought only two of them. Now mostly Manu and I use these mugs. He won't let Mira use them. I have tried to find any difference between these two but found them identical but somehow Manu manages to differentiate them. He says one is his and one is mine and he also knows which one is his and which one is mine. “No this is Papa's give me mine” is what he says sometimes when we give him one of these mugs. Don't know how he can tell the difference.