Hold a bank card against the screen and resize the outline until it matches the card exactly (use the slider, drag the card's right edge, or the arrow keys). This tells the app how large the stimuli are in millimetres on this screen. Redo it if you change screen or browser zoom.
to build a question: place three objects, shift-click them (or shift-drag a box around them), then “make similarity question”.
Double-click a text to edit it in place (Enter keeps it, shift+Enter adds a line, Escape puts the old one back). Drag to move; texts stay out of runs and exports.
SVG + PNG of every question in this experiment and a manifest.csv with the full parameter record, in one zip.
Participants' responses are stored in your own Supabase project, and the AI function can run there too. One-time setup: run server/supabase/schema.sql in the SQL editor and add yourself as a user — the steps are in server/supabase/README.md.
“describe…” in the experiment strip turns a description of the experiment you want into shapes and questions on the canvas.
Each figure is centred on its rotation centre, so rotated versions line up. The zip also holds a manifest (CSV and XLSX) with every parameter, the figure size in pixels and mm, and the questions that use each image.
Claude turns this into shapes, similarity questions (as rotation triples) and a new experiment on the canvas. Everything stays editable, and ⌘/ctrl Z removes it all. ⌘/ctrl Enter generates.
On each trial you will see three figures. Decide whether A is more similar to B or to C, and answer with the B or C key (or the buttons). Answer as accurately as you can; there are no right or wrong answers.