Photo stoRy for today™ – What do Réne Descartes and Stockholm have in common?

“Cogito ergo sum – I think therefore I am” These philosophical sentence by  Réne Descartes is probably his most famous one. He was a French philosophe and mathematician. What does he has in common with Stockholm? He spent the last months of his life here before he died in February 1650 in the house in Stockholm’s Old Town captured on this picture.