“Our ancestors lived in the oceans. Because of how light travels through water versus air, their sensory volume—the region in which they could scan for prey—was limited to their motor volume—the region they could actually reach and interact with. What do you think the result of that might be?” She considers the question. “They could only react to immediate stimuli.” “OK. Now, what do you think happened when those fish finally crawled out of the ocean four hundred million years ago?” “Their sensory volume increased, since light travels farther in air than in seawater.” “Some evolutionary
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