Pottermore Publishing

“Fluffy is a call-back to Cerberus, the Classical three-headed mythological beast and guard dog to the gates of hell, which Hercules had to capture as one of his twelve labours. The depiction of Cerberus and Hercules by Aegidius Sadeler II, engraver in the court of Rudolf II in Prague (made some time between 1586 and 1629), made the gates of hell look like a flaming brick prison. What’s interesting about the image of Hercules dragging the dark, muscular, fanged beast in his left hand and the way it is composed is the angle. You’re compelled to follow the action from right to left, as opposed to the conventional Western habit of reading left to right. This inversion could be because we are in the underworld, where logic, physics and, indeed, art are turned on their head. What also links Cerberus to Fluffy and the Philosopher’s Stone is that in capturing Cerberus and taking him to King Eurystheus (who was so terrified he immediately jumped into a large jar to escape), Hercules gained immortality by completing his penance. And just like Harry in his epic struggle to find the Philosopher’s Stone, Hercules did so less through physical effort than through courage and strength of mind.”
― Pottermore Publishing, Harry Potter: A Journey Through Potions and Herbology

“Several boys about Harry’s age had their noses pressed against a window with broomsticks in it. ‘Look,’ Harry heard one of them say, ‘the new Nimbus Two Thousand – fastest ever –’ Harry Potter and the Philosopher’s Stone”
― Pottermore Publishing, Harry Potter: A Journey Through Charms and Defence Against the Dark Arts