The 17th & 18th centuries were the eras of science Two of the most impressive personalities of that time were Leonard Euler & Maria Sibylla Merian (who in fact were related) Leonard Euler was a famous mathematician who rendered outstanding services to the number pi Maria Sibylla Merian was not only a naturalist & explorer but also an artist Her name stands for the style of detailed portrayal of nature – see her works on the metamorphosis of caterpillars to butterflies The illustrations in this card game shall breathe life into that style again The name Pi mal Pflaumen is a play on the expression " Pi mal Daumen" — "rule of thumb" or "roughly" — which also originated in that period but now instead of thumbs players are concerned with fruit On a turn players play one fruit card from their hand at a time then they each claim one of the played cards based on the strength of the card that they played Each card depicts a fruit & some of the cards also feature a scoring pattern (eg hand in three identical fruits or two pairs of matching fruits) or a special action such as collecting an additional plum card stealing a card from an opponent taking the dog to protect yourself from theft or collecting three π cards (which can be played singly or in combination with a number card to increase the value of your initial play) After a number of turns based on the number of players the round ends then players receive a new hand of cards After three rounds players tally their points based on completed contracts & whoever has the high score wins