I really like this post on Grant's reading of Schelling. HT Michael of Archive Fire.
Why the Doctor Who chocolate? Well I used to eat it in the mid-70s (3p!). And those Doctor Who's were all about motorized rubber sfx, aka slime dynamics, the nature of the Universe. Let my good buddy Ben Woodard explain. And Doctor Who's time tunnel was pretty slimy at that point. And chocolate is melty. &c.