Downsampling in the human visual system:
Retina: ~130 million photoreceptors
↓ (huge compression)
Optic nerve: ~1 million ganglion cells
↓ (further processing)
V1 cortex: ~280 million neurons (but organized hierarchically)
Plus: Your fovea (central vision) has high resolution, but peripheral vision is heavily downsampled. Your brain reconstructs a "full resolution" world from mostly low-res input.