diff --git a/src/aphorisms/twenty-one.clj b/src/aphorisms/twenty-one.clj
new file mode 100644
index 0000000..4e878eb
--- /dev/null
+++ b/src/aphorisms/twenty-one.clj
@@ -0,0 +1,86 @@
+(ns aphorisms.twenty-one
+  (:require [quil.core :as q]
+            [quil.middleware :as qm]
+            [thi.ng.geom.rect :as r]
+            [clojure.string :as str]))
+
+;; https://10print.org/
+
+(def bounds (r/rect 540 960))
+
+(defn setup []
+  (q/frame-rate 30)
+  (q/rect-mode :center)
+  (q/ellipse-mode :center)
+  (q/color-mode :hsb 100 100 100)
+  {:x-off 0.022
+   :y-off 0.033})
+
+(defn update-state [state]
+  state)
+
+(def tile-size 30)
+
+(defn draw-tile [[x y] tile-type]
+  (let [start (case tile-type
+                :a 0
+                :b q/HALF-PI)]
+    (q/arc x y tile-size tile-size start (+ start q/PI))))
+
+(defn pick-at [xs rand-val]
+  (nth xs (Math/round (* rand-val (dec (count xs))))))
+
+(defn draw-state [state]
+  (let [margin (* 2 tile-size)
+        grey-tone (/ 100 16)]
+    (q/no-fill)
+    (q/background (* 2 grey-tone))
+    (q/stroke 0 0 (* 14 grey-tone))
+    (q/stroke-weight 3)
+    (q/stroke-cap :round)
+    (doseq [y (range margin (- (-> bounds :size :y) margin -1) tile-size)
+            x (range margin (- (-> bounds :size :x) margin -1) tile-size)
+            :let [n (q/noise (* (:x-off state) x #_(q/millis))
+                             (* (:y-off state) y #_(q/millis)))]]
+      (draw-tile [x y] (pick-at [:a :b] n)))))
+
+;; sketch export logic
+
+(defn current-time []
+  (->
+   (.format java.time.format.DateTimeFormatter/ISO_LOCAL_DATE_TIME (java.time.LocalDateTime/now))
+   (str/replace  #"\.\d+$" "")
+   (str/replace #":" "-")))
+
+(defn export [{:keys [x-prog y-prog]}]
+  (let [filename (format "%s-x%s-y%s-%s.png" *ns* x-prog y-prog (current-time))]
+    (q/save filename)
+    (println "Saved current sketch to " filename)))
+
+(defn key-pressed [state {k :raw-key}]
+  (cond
+    (#{\e \s} k)
+    (do
+      (export state)
+      state)
+
+    (= k \r)
+    (let [x-off (* (rand-int 1000) 0.0001)
+          y-off (* (rand-int 1000) 0.0001)]
+      (println "New offsets: " x-off ", " y-off)
+      (-> (assoc state :x-off x-off)
+          (assoc :y-off y-off)))
+
+    :else state))
+
+#_:clj-kondo/ignore
+(q/defsketch twenty-one
+  :title "Twenty-One"
+  :size (:size bounds)
+  :settings #(q/pixel-density (q/display-density))
+  :setup setup
+  :update update-state
+  :draw draw-state
+  :key-pressed key-pressed
+  :middleware [qm/pause-on-error qm/fun-mode]
+  :features [:keep-on-top])
diff --git a/src/aphorisms/twenty_five.clj b/src/aphorisms/twenty_five.clj
new file mode 100644
index 0000000..e72919e
--- /dev/null
+++ b/src/aphorisms/twenty_five.clj
@@ -0,0 +1,52 @@
+(ns aphorisms.twenty-five
+  (:require [quil.core :as q]
+            [quil.middleware :as qm]
+            [thi.ng.geom.rect :as r]
+            [thi.ng.geom.core :as g]))
+
+(def bounds (r/rect 200 200))
+
+(defn setup []
+  (q/frame-rate 30)
+  (q/ellipse-mode :center)
+  (q/color-mode :hsb 100)
+  {})
+
+(defn update-state [_]
+  _)
+
+(defn divisors [n]
+  (->>
+   (range 1 (inc (int (/ n 2))))
+   (filter #(zero? (rem n %)))))
+
+(divisors 800)
+;; => (1 2 4 5 8 10 16 20 25 32 40 50 80 100 160 200 400)
+(divisors 230)
+;; => (1 2 5 10 23 46 115)
+
+(def x-noise-scale 0.006)
+(def y-noise-scale 0.005)
+
+(defn draw-state [_]
+  (q/background 100)
+  (q/stroke-weight 1)
+  (doseq [y (range 0 (inc (- (g/height bounds) 10)) 10)
+          x (range 0 (inc (- (g/width bounds) 10)) 10)
+          :let [noise-x (* x x-noise-scale)
+                noise-y (* y y-noise-scale)]]
+    (q/with-translation [(+ x 5) (+ y 5)]
+      (q/with-rotation [(* q/TWO-PI (q/noise noise-x noise-y))]
+        (q/stroke (q/map-range (* noise-x noise-y) -1 1 90 70) 60 80)
+        (q/line [-3 0] [3 0]))))
+  (q/save-frame "exports/twenty-five--business-card.png"))
+
+#_:clj-kondo/ignore
+(q/defsketch twenty-five
+  :title "Twenty-Five"
+  :size (:size bounds)
+  :settings #(q/pixel-density (q/display-density))
+  :setup setup
+  :update update-state
+  :draw draw-state
+  :middleware [qm/pause-on-error qm/fun-mode])
diff --git a/src/aphorisms/twenty_four.clj b/src/aphorisms/twenty_four.clj
index c324ab4..eb1643f 100644
--- a/src/aphorisms/twenty_four.clj
+++ b/src/aphorisms/twenty_four.clj
@@ -5,10 +5,6 @@
             [thi.ng.geom.core :as g]
             [thi.ng.math.core :as m]))
 
-;; I'm in bed. It is 9th of October, the temperatures are mild, the sund is
-;; shining and my girlfriend is reading me texts about the physical appearance
-;; of angels.
-
 (def bounds (r/rect 540 960))
 
 (defn setup []