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+Minimizing your keyboard layout is a slippery slope. A few
+months ago, I built the
+[Ferricy](https://github.com/icyphox/ferricy), a
+34-key-split-ortho-ergo keyboard. The Ferricy is a fork of
+the [Ferris Sweep MX
+Bling](https://github.com/davidphilipbarr/Sweep/tree/main/Sweep%20Bling%20MX).
+
+![The Ferricy, designed by [icyphox](https://icyphox.sh)](https://u.peppe.rs/otz.jpg)
+
+
+My daily use consists of a bit of prose and a lot of
+program, my layout has evolved accordingly.
+
+# Base Layer 
+
+![Colemak with no mods](https://u.peppe.rs/base.png)
+
+The base layer contains alphabets, four symbols and four
+whitespace keys:
+
+- Alphas: Stock Colemak, with no modifications whatsoever
+- Symbols: `. , / ;`
+- Whitespace: tab, space, enter, backspace (from left to
+  right)
+
+# Layers
+
+Keyboard input is complex and it is impossible to skirt
+around it. You can either use a keyboard with enough keys to
+supply all possible inputs (a mechanical burden), or you can
+use firmware to supply all possible inputs (a cognitive
+burden). Layers are a cognitive burden.
+
+I use 3 layers, heavily inspired by
+[Miryoku](https://github.com/manna-harbour/miryoku), but
+tuned for programming. Excluding the base Colemak layer:
+
+- `NAV`: activated on holding `space` (left thumb)
+- `NUM`: activated on holding `tab` (left thumb)
+- `SYM`: activated on holding `enter` (right thumb)
+
+## The `NAV` Layer
+
+As the name suggests, this layer is focused on navigation.
+Arrow keys and the likes. 
+
+![`NAV`, on holding `space`](https://u.peppe.rs/nav.png)
+
+Using Vim and Colemak means you lose out on HJKL navigation.
+However, on activating the `NAV` layer, the right home-row is
+converted into arrow keys. In essence, by holding space, I
+can navigate Vim with the home-row, or Firefox, or my PDF
+reader. I no longer need to look for software that allows
+Vim navigation keys, because it is baked into the firmware!
+  
+My Vim motions are not limited to HJKL. In fact, my Vim
+motions are rarely HJKL. I tend to use `}` (next paragraph)
+and `)` (next sentence) more often. As a result, these have
+found their way into my `NAV` layer, over the likes of
+`PgDown` and `End`. Having brackets at my index and middle
+fingers is nice for programming too.
+  
+## The `SYM` Layer
+
+![`SYM`, on holding `enter`](https://u.peppe.rs/sym.png)
+
+This layer contains all the symbols that you would find by
+hitting `Shift` and a key on the number row. Probably
+noteworthy to Vim users: the symbols are arranged in the
+form of a mirrored numpad for exactly one reason: to move
+`$` to the left of `^`. It has always annoyed me that `$`
+moves the cursor to the end of the line and `^` moves it to
+the beginning, but their position on a typical number row
+are reversed, 4 comes before 6.
+
+## The `NUM` layer
+
+![`NUM`, on holding `tab`](https://u.peppe.rs/num.png)
+
+Another deviation from Miryoku, the numpad just feels _right_
+on my _right_ hand.
+
+# ZMK Combos
+
+If you have been paying close attention, you might have
+noticed that `escape` didn't make it to any layer. `escape`
+is too crucial to put on a non-base layer, but at the same
+time, not as important to deserve a place on the base layer.
+That is where ZMK's combos come in. Combos let you tap any
+number of keys, and combine them to form a single key. I
+have combos set up for underscore, minus, escape and
+caps-word (more on caps-word later):
+
+![Combos are almost piano-like](https://u.peppe.rs/combos.png)
+
+# Home-row Mods
+
+Inherited from Miryoku, I have home-row mods for activating
+`Super`, `Alt`, `Shift`, `Ctrl` and `Hyper` (`Ctrl + Shift +
+Alt + Super`). The idea is to send `T` on tap and `Ctrl` on
+hold. Home-row mods are fairly popular, so I'll not go into
+the details.
+
+![Super, Alt, Shift, Ctrl, Hyper; on the left half, and
+mirrored on the right half](https://u.peppe.rs/homerow.png)
+
+`Hyper` bridges the gap between firmware and software. You
+can never configure key combination that, opens Firefox, for
+example, through firmware alone. However, with the `Hyper`
+key, and some `sxhkd` magic, you can emulate that. Pressing
+`Hyper + F` on a keyboard is just two keys, but the key
+codes sent are `Ctrl + Shift + Alt + Super + F`. That key
+combination is not intercepted by any application as a
+shortcut, except for the following `sxhkd` stanza:
+
+```bash
+super + alt + shift + ctrl + f
+  xdotool search "Mozilla Firefox" windowactivate
+```
+
+Alternatively, you can intercept unused `F` keys: `F13`
+through `F24`.
+
+Home-row mods are mirrored on each half because it would be
+impossible to hit `Ctrl + T` if not; they lie on the same
+key.
+
+# Caps-word
+
+Caps-word is a clever caps-lock, built into ZMK. Typing out
+constants such as `PORT` with home-row mods would look like
+this:
+
+- hold `e` (shift) on left hand, and tap `p` on right hand
+- hold `e` (shift) on left hand, and tap `o` on right hand
+- hold `s` (shift) on right hand, and tap `r` on left hand
+- hold `s` (shift) on right hand, and tap `t` on left hand
+
+This hold-alternate-hold dance gets tiring quickly. With
+caps-word, however:
+
+- toggle `caps_word`
+- type out `p`, `o`, `r`, `t`
+- hit a _break_ character (space, enter will do)
+- continue
+
+Caps-word automatically disables capitalization upon
+encountering a breaking character, (which are space, enter
+or any modifier, by default) right in the firmware!
+
+# Findings
+
+34-keys has been reasonably comfortable to use, for both
+prose and program. My palms do not move across the desk at
+all, as I reach for keys. I mostly write Rust and Bash, and
+my layout has evolved to accomodate special characters from
+their grammars (angled brackets and hyphens, specifically).
+If you are on a similar journey, I would suggest focusing on
+accuracy and comfort over speed. Speed comes with time.