Editorial Policy

These rules apply to every page on this site.

Numbers come from the build

Every number you see on a page comes from a data file written by a build script. The script measures the rendered image and writes the result. Nobody types a figure by hand.

Facts need a source

A claim about who described an illusion, or when, appears only after we confirm the claim against an encyclopedic or primary source. Each confirmed fact links to its source on the page. Where sources disagree, we leave the detail out.

Original images

The site draws every image itself. We do not copy famous illusion images.

What we never publish

Testimonials, reviews or user counts.
Expert names or credentials.
Claims about IQ, intelligence, eyesight or health.
Animation flashing more than three times a second.

Page count

Page count follows tool count. Each page carries a working tool or its own measured data. We make pages only for a short, curated list of words. We do not generate pages for names or arbitrary input.

How text is written

Drafts are written with software assistance. The site owner reviews the text before publishing.

Corrections