SelzeroHume wrote about how perceived similarity is a factor of empathy, for example, a human cannot relate to a piece of string.
The piece of string.
Keith Wansbrough@selzero alt: a piece of string stands vertically on a card. It is kept in tension by five bits of clear plastic bent into hoops, overlapping one with the next. The card has part of a logo visible, maybe Alstom. Text overlaid on the image says "the string wants to collapse but constant stress won't allow that".