aphantasia

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Calculus (Wikipedia) Calculus is the mathematical study of continuous change, in the same way that geometry is the study of shape, and algebra is the study of generalizations of arithmetic operations.

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How to See Bright, Vivid Images in Your Mind’s Eye (photographyinsider.info) Before I learned the technique that I’m about to share with you, experimenting with photographic composition was a manual task. I had to physically stand in front of my subject and actually move things. That, or I would fetch a sketchbook & pencils and begin drawing my ideas on paper.

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nervous system

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Aphantasia (Wikipedia) Aphantasia (/ˌeɪfænˈteɪʒə/ ay-fan-TAY-zhə, /ˌæfænˈteɪʒə/ a-fan-TAY-zhə) is the inability to create mental imagery.