Tag Archives: optical illusions

Two random items for Monday

I’ve been enjoying Quintessence of Dust, the blog of Calvin College biologist Stephen Matheson, quite a lot lately. It’s a high-level but clearly-written excursion through all sorts of issues in biology — including evolution, though not from the stance you might be used to coming from a Christian.

Anyway, two cool things from this blog today:

  • This incredible optical illusion, attached to a neuroscience-related article explaining how it works and how it relates to the brain’s processes of interpreting visual information. I agree with Matheson’s remark: “If you have built your worldview around the perfection of your sensory input, you might want to skip this one.”
  • This online biology textbook from an Arzona community college. I don’t have a print copy of a biology textbook to compare it with, and can scarcely remember enough biology from college to know how even to make such a comparison, but it certainly looks complete and well-done. And I have a thing for free textbooks.

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