When you’ve got some pebbles, in an arbitrary arrangement, between the sole of your shoe and the sidewalk, and there is no contact between your sole and the sidewalk, then your weight is distributed roughly equally to all pebbles and from them to the ground. The fewer the number of pebbles under your sole, the more weight each pebble is dealt. If there are zero pebbles under your sole, such that your sole is in contact with the sidewalk as much as is possible, how many pebbles under your sole would it take to model this situation? An infinite number? In other words, when two flat solid surfaces are pressed flush against each other, how many contact points are there between them? I’ve been walking a lot lately.