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diff --git a/guile/starlet/attributes.scm b/guile/starlet/attributes.scm
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+;;
+;; starlet/attributes.scm
+;;
+;; Copyright © 2022-2023 Thomas White <taw@bitwiz.org.uk>
+;;
+;; This file is part of Starlet.
+;;
+;; Starlet is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+;;
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+;;
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+;;
+(define-module (starlet attributes)
+  #:use-module (oop goops)
+  #:export (<starlet-attribute>
+             make-attribute
+             attribute?
+             intensity?
+             canonical-name
+             friendly))
+
+
+(define-class <starlet-attribute> (<object>)
+  (canonical-name
+    #:init-keyword #:name
+    #:getter canonical-name)
+  (friendly
+    #:init-keyword #:friendly
+    #:getter friendly))
+
+(define (make-attribute canonical-name friendly)
+  (make <starlet-attribute>
+        #:name canonical-name
+        #:friendly friendly))
+
+(define (attribute? a)
+  (is-a? a <starlet-attribute>))
+
+(define-method (write (attribute <starlet-attribute>) port)
+  (write
+    (canonical-name attribute)
+    port))
+
+(define-method (canonical-name whatever)
+  whatever)
+
+
+(define-syntax define-attribute
+  (syntax-rules ()
+    ((_ name friendly-name)
+     (define-public name (make-attribute (quote name) friendly-name)))))
+
+
+;; The standard attribute names
+(define-attribute intensity "Intensity (percentage of brightest)")
+(define-attribute colour "Colour (colour object)")
+(define-attribute colour-temperature "Colour temperature (K)")
+(define-attribute strobe "Strobe active (boolean)")
+(define-attribute strobe-frequency "Strobe rate (Hz)")
+(define-attribute pan "Moving head pan angle (degrees +/- from home)")
+(define-attribute tilt "Moving head tilt angle (degrees +/- from home)")
+(define-attribute prism "Prism active (boolean)")
+(define-attribute prism-rotation-speed "Prism rotation speed (+/- percentage of fastest, clockwise)")
+(define-attribute frost "Frost active (percentage of maximum frost)")
+(define-attribute hotspot "Hot spot (percentage of maximum peakiness)")
+(define-attribute iris "Iris (percentage of maximum tightness (perhaps completely closed)")
+(define-attribute zoom "Zoom (percentage of tightest zoom)")
+(define-attribute focus "Focus (percentage of nearest focus)")
+(define-attribute barndoor-all-rotation "Rotation of all barndoors together (degrees +/- from home)")
+(define-attribute barndoor1 "Barndoor 1 position (percentage of fully in position)")
+(define-attribute barndoor2 "Barndoor 2 position (percentage of fully in position)")
+(define-attribute barndoor3 "Barndoor 3 position (percentage of fully in position)")
+(define-attribute barndoor4 "Barndoor 4 position (percentage of fully in position)")
+(define-attribute barndoor1-rotation "Barndoor 1 rotation (degrees +/- from home)")
+(define-attribute barndoor2-rotation "Barndoor 2 rotation (degrees +/- from home)")
+(define-attribute barndoor3-rotation "Barndoor 3 rotation (degrees +/- from home)")
+(define-attribute barndoor4-rotation "Barndoor 4 rotation (degrees +/- from home)")
+(define-attribute beamtype "Beam type")
+(define-attribute colwheel "Colour wheel selection (#f or gel name)")
+(define-attribute gobo "Gobo selection (#f or gobo name)")
+(define-attribute gobo-shift "Fine position of gobo (percentage of maximum shift)")
+(define-attribute animation-wheel "Animation wheel active (boolean)")
+(define-attribute animation-wheel-position "Animation wheel position (-100 to 100, 0=central)")
+(define-attribute animation-wheel-speed "Animation wheel rotation speed and direction (+/- percentage of fastest, clockwise)")
+(define-attribute rotating-gobo "Rotating gobo selection (#f or gobo name)")
+(define-attribute rotating-gobo-speed "Gobo rotation speed (+/- percentage of maximum speed, clockwise)")
+(define-attribute white-weirdness "Weirdness of white (percentage of maximum weirdness)")
+
+;; Duplicate names for convenience...
+(define-public color colour)
+(define-public color-temperature colour-temperature)
+
+
+(define (intensity? a)
+  (eq? intensity a))
+