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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 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))
+
+
+(define-class <starlet-attribute> (<object>)
+  (canonical-name
+    #:init-keyword #:name
+    #:getter canonical-name))
+
+(define (make-attribute canonical-name)
+  (make <starlet-attribute>
+        #:name canonical-name))
+
+(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)
+
+
+;; The standard attribute names
+;; Note that this list says nothing about the interpretation of the values
+;; - that's left to the individual fixture definitions.
+(define-public intensity (make-attribute 'intensity))
+(define-public colour (make-attribute 'colour))
+(define-public colour-temperature (make-attribute 'colour-temperature))
+(define-public strobe (make-attribute 'strobe))
+(define-public strobe-frequency (make-attribute 'strobe-frequency))
+(define-public pan (make-attribute 'pan))
+(define-public tilt (make-attribute 'tilt))
+(define-public prism (make-attribute 'prism))
+(define-public frost (make-attribute 'frost))
+(define-public hotspot (make-attribute 'hotspot))
+(define-public iris (make-attribute 'iris))
+(define-public zoom (make-attribute 'zoom))
+(define-public barndoor-rotation (make-attribute 'barndoor-rotation))
+(define-public barndoor1 (make-attribute 'barndoor1))
+(define-public barndoor2 (make-attribute 'barndoor2))
+(define-public barndoor3 (make-attribute 'barndoor3))
+(define-public barndoor4 (make-attribute 'barndoor4))
+(define-public beamtype (make-attribute 'beamtype))
+(define-public colwheel (make-attribute 'colwheel))
+(define-public gobo (make-attribute 'gobo))
+
+;; Duplicate names for convenience...
+(define-public color colour)
+(define-public color-temperature colour-temperature)
+
+
+(define (intensity? a)
+  (eq? intensity a))
+