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  When you learned to subtract numbers by hand, did you learn it with this "borrowing" method? I forgot how to subtract say 384 from 2173 and asked some chatbots "how do you subract by hand with pen and paper". They all explain it with this super strange borrowing method. Here in Switzerland I just learned to add a 1 if you cross zero...

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  Small blog post on blending https://oliverwipfli.ch/canvas-multiply-blending-2025-11-24/

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  @behdad Do you think the Slug Library could be used to create a renderer for COLRv1 fonts like Google's Noto Color Emoji font?

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  RE: https://mastodon.online/@rkaravia/116493454844120783 Nice!

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  Tiered local storage: Working with aerial imagery comes with some very enjoyable technical problems around storage. I wrote a small blog post about the storage system of Mapterhorn. Read more here: https://oliverwipfli.ch/tiered-local-storage-2026-06-08/

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  Blog post "Callback on File System Reads": https://oliverwipfli.ch/callback-on-file-system-reads-2026-06-22/

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  @cartocalypse thank for sharing. I did not know that tool. Happy to try it out

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  Blog post about "Finding Cheap Compute": https://oliverwipfli.ch/finding-cheap-compute-2026-07-16/

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  I wrote a small blog post about Mapterhorn's current status and the plans on adding aerial imagery: https://oliverwipfli.ch/mapterhorn-update-2026-04-14/