Keep your smart-phone by your bed? You shouldn’t. But see if you can spot the relevant lines in Chaucer:
“His Almageste and bokes grete and smale,
His astrelabie, longinge for his art,
His augrim-stones layen faire a-part
On shelves couched at his beddes heed …”
The picture, here, is of Clerk Nicholas keeping his algorithm tool (augrim-stones) at the head of his bed …. Incredible.