We're toys. The scale is fluid because the scale among toys is fluid. Green Army Men should be the same height as Woody since they're both representations of adult males, but they're much smaller than Woody.So have we yet figured out what our role is in this land? Now that we've seen the model, it's clear that we're not toys, unless we're incredibly tiny ones. Are we insects? Bacteria?
If such fluidic change in scale melts one's brain, then I certainly hope one stayed away from any M&Gs with Woody and GAM and discovered they're the same height!
When children play with toys with such disparate scales, they generally just don't care. "Mommy, why isn't Mr. Potato Head the size of a Green Army Man fist?"