Blood vessels casting a shadow.
Levick
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WR
D000818:Animals; D002415:Cats; D008027:Light; D009898:Optic Disk; D012165:Retinal Ganglion Cells / Q000502:physiology*; D012171:Retinal Vessels / Q000033:anatomy & histology*; D015348:Vision, Binocular; D014793:Visual Cortex / Q000033:anatomy & histology* / Q000502:physiology*; D014795:Visual Pathways