Found these most coolest cups ever! Saw them in Switserland at a design cooking shop. They are from Revol, a French brand founded in the 18th century. It is just like you have squeezed the cup, so it would fit right into the palm of your hand. Actually they are made of porcelain. Couldn't find a Dutch website, but my sister in law did! At EasyGet you can find the same cups, but designed by Rob Brandt in white. So if you want to buy them in the Netherlands it is possible!