Simon Tatham

Simon Tatham✓

Mastodon @simontatham@hachyderm.io
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📣Sponsored postOne disclosed post (toot) with your link and message. $29→ 🧵Sponsored threadA multi-post explainer or story — the fediverse rewards dept… $73→ 📦Product seeding / honest reviewSend me your product — I post a disclosed, honest take. Auth… $38→ 📌Pinned sponsored postA disclosed post pinned to the top of my profile for the mon… $87/mo→ 🔗Profile link (bio field)Your link in one of my profile metadata fields for the month… $44/mo→ 🔁Boost packageI boost (repost) your account's toots through the month — di… $58/mo→ 🏛️Instance / community sponsorshipSponsor the server I run — a sponsor line in the About/rules… $73/mo→ 🤝Mutual boost collabWe boost each other across instances — a value swap between … Swap→

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Followers
4.8K
Account age
2 yrs

Known for

Visiting my sister and family for Christmas, and they have a shiny new 3D printer, so naturally we've been playing with it. Here's a hats-and-turtles jigsaw puzzle. The puzzle was made by taking a hat tiling and its combinatorially identical turtle tiling, and making a puzzle piece from each pair of211 views Visiting my sister and family for Christmas, and they have a shiny new 3D printer, so naturally we've been playing with it. Here's a hats-and-turtles jigsaw puzzle. The puzzle was made by taking a hat tiling and its combinatorially identical turtle tiling, and making a puzzle piece from each pair of Once at university we accidentally invented Hexagonal Quantum Chess. Chess-like games on a hex board have been thought of before, of course. But one afternoon we had a hex board and some pieces and nothing better to do, so we tried to make up one of our own. Our pawns were very powerful, because the66 views Once at university we accidentally invented Hexagonal Quantum Chess. Chess-like games on a hex board have been thought of before, of course. But one afternoon we had a hex board and some pieces and nothing better to do, so we tried to make up one of our own. Our pawns were very powerful, because the I've recently been rewriting my substitution-tiling transducers code in #RustLang, replacing the old Sage code. One reason is that Sage is harder to run these days. It vanished from Ubuntu some time between 22.04 and 24.04 and hasn't (yet?) come back. Another reason was that reimplementing all my al66 views I've recently been rewriting my substitution-tiling transducers code in #RustLang, replacing the old Sage code. One reason is that Sage is harder to run these days. It vanished from Ubuntu some time between 22.04 and 24.04 and hasn't (yet?) come back. Another reason was that reimplementing all my al Last month I asked for recommendations for graph layout tools. Thanks to everyone who suggested something! I've now finished the task I wanted them for, so have some pretty (ish) pictures. In the end, I didn't use anything more complicated than Dotty, and I didn't even use Dotty on the _full_ versio51 views Last month I asked for recommendations for graph layout tools. Thanks to everyone who suggested something! I've now finished the task I wanted them for, so have some pretty (ish) pictures. In the end, I didn't use anything more complicated than Dotty, and I didn't even use Dotty on the _full_ versio

📊 Post engagement

51
Avg engagement / post
1.1%
Engagement vs followers
Sep 2023
On Mastodon since

🔥 Top post: Visiting my sister and family for Christmas, and they have a shi · 211 likes + reposts

📊 Activity & format

Posting cadence
0.54 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly images
Recent: 0 text · 12 image · 0 video.
Follower / following
149×
Follows 32 back. A strong ratio — an audience that follows them, not a follow-for-follow network.

Recent posts

View on Mastodon ↗
🔥 Top post Visiting my sister and family for Christmas, and they have a shiny new 3D printer, so naturally we've been playing with it. Here's a hats-and-turtles jigsaw puzzle. The puzzle was made by taking a hat tiling and its combinatorially identical turtle tiling, and making a puzzle pi… ★ 211
Late-night prototype of an alternative UI: Snooker Loopy. ★ 43 Once at university we accidentally invented Hexagonal Quantum Chess. Chess-like games on a hex board have been thought of before, of course. But one afternoon we had a hex board and some pieces and nothing better to do, so we tried to make… ★ 66 It's not Tuesday any more, but here are a few more bonus pretty pictures. There's a clever construction called the "Wieringa roof" in which you assign every vertex of a P3 rhomb tiling a z-coordinate in {1,2,3,4}, with each rhomb having co… ★ 19 For #TilingTuesday, 4-colourings of the Penrose P2 and P3 tilings, via refinements of their substitution systems. Penrose tilings must _admit_ proper 4-colourings, by the Four Colour Theorem and the Erdős–de Bruijn theorem. 4CT says that a… ★ 48 Last month I asked for recommendations for graph layout tools. Thanks to everyone who suggested something! I've now finished the task I wanted them for, so have some pretty (ish) pictures. In the end, I didn't use anything more complicated… ★ 51 I was really pleased with this daft idea. And it worked! I got a successful run of it on the OS OpenData's incomplete outline of the coastline of Great Britain. With hindsight, there are several problems with it. What if an edge of the inp… ★ 14 A flow network is a graph, with each edge imagined as a pipe through which some kind of fluid can flow. Edges are annotated with _capacities_ – the maximum rate at which fluid can flow through that pipe. Some vertices are _sources_ (fluid … ★ 8 Given a set S of points in the plane, the _Voronoi cell_ of a point P ∈ S is the region of the plane which is closer to P than to any other point of S. A Voronoi cell is a polygon; where two cells touch, say for points P and Q, the edge be… ★ 6 What does a Voronoi diagram have to do with a flow network? Some years ago I was trying to make 3D-printable models of Britain for a friend. (Both the whole of Great Britain as a single model, and also zooming in to model individual mounta… ★ 51 Just because I expect someone will appreciate it, here's a pristine version of the larger image, containing just the Spectre tiles, without the hexagon drawn on top. ★ 23 I've recently been rewriting my substitution-tiling transducers code in #RustLang, replacing the old Sage code. One reason is that Sage is harder to run these days. It vanished from Ubuntu some time between 22.04 and 24.04 and hasn't (yet?… ★ 66

🐘 Community & instance

Home server
hachyderm.io
A tech & engineering server — its members and audience skew toward that niche, so expect a community-aligned, engaged following.
✅ Link-verified
Verified link
Proved ownership of a website linked on their profile — Mastodon's green-check verification, a real identity signal rather than a paid badge.
On Mastodon since
Sep 2023
An established account with real history on the platform.

💡 Facts

🗓️Joined Mastodon in 2023 — 2 years ago.
👁️Averages 51 views per post.
📤Posts about 0.5× per week.

🛡️ Audience credibility

76/100 Good
  • Est. 85% real, active audience · Low fake-follower risk.
  • Content engagement (~1.1% of followers) is around typical for Mastodon.
  • Verified account.
  • Established account (2+ years old).
Est. authentic audience
85%
Fake-follower risk
Low

Heuristic estimate from view-through, engagement vs size and recent growth — a screening signal, not a guarantee.

About

Free software developer and hobby mathematician. Author and lead developer of #PuTTY, and "Simon Tatham's Portable Puzzle Collection", a set of one-player puzzle games running on many platforms. Also various smaller or less well known things.

📸 Gallery

Late-night prototype of an alternative UI: Snooker Loopy. Once at university we accidentally invented Hexagonal Quantum Chess. Chess-like games on a hex board have been thought of before, of course. But one afternoon we had a hex board and some pieces and nothing better to do, so we tried to make up one of our own. Our pawns were very powerful, because the It's not Tuesday any more, but here are a few more bonus pretty pictures. There's a clever construction called the "Wieringa roof" in which you assign every vertex of a P3 rhomb tiling a z-coordinate in {1,2,3,4}, with each rhomb having coordinates either 1,2,3,2 or 4,3,2,3, so that the tiling is li For #TilingTuesday, 4-colourings of the Penrose P2 and P3 tilings, via refinements of their substitution systems. Penrose tilings must _admit_ proper 4-colourings, by the Four Colour Theorem and the Erdős–de Bruijn theorem. 4CT says that any finite patch of a given plane tiling must have a 4-colouri Last month I asked for recommendations for graph layout tools. Thanks to everyone who suggested something! I've now finished the task I wanted them for, so have some pretty (ish) pictures. In the end, I didn't use anything more complicated than Dotty, and I didn't even use Dotty on the _full_ versio I was really pleased with this daft idea. And it worked! I got a successful run of it on the OS OpenData's incomplete outline of the coastline of Great Britain. With hindsight, there are several problems with it. What if an edge of the input near-polygon connects two polygon vertices whose Voronoi c A flow network is a graph, with each edge imagined as a pipe through which some kind of fluid can flow. Edges are annotated with _capacities_ – the maximum rate at which fluid can flow through that pipe. Some vertices are _sources_ (fluid is imagined to enter the graph there) and some are _sinks_ (f Given a set S of points in the plane, the _Voronoi cell_ of a point P ∈ S is the region of the plane which is closer to P than to any other point of S. A Voronoi cell is a polygon; where two cells touch, say for points P and Q, the edge between them is the perpendicular bisector of the line PQ. If t

🔀 Audience overlap

Estimated

Estimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.

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