The colours

The colour is drawn before your choice, then locked away, like a card in a sealed envelope (fig. 1). The server shows you only the seal: sixty-four characters that say nothing about the colour. You choose. Only then is the colour revealed, with what you need to check that the seal was indeed that one. How to check

Chance gives you one success in four: five out of twenty. Eight, or two, often happen with no other cause. A series therefore says nothing about you. What counts is a gap that comes back, over hundreds of attempts and over weeks.

This exercise has no diagnostic value, and does not measure an ability.

Why an account

Your account keeps every series in a logbook, and draws your curve. From two hundred attempts, it places you in the Centre’s ranking, recalculated after each series. Below that, the gap from chance means nothing. This account belongs to cepeu.fr alone, independent of the Δ Delta Score application, and you can delete it at any time from this page.

This exercise is a matter of observation, not of care nor of measuring an ability. It has no diagnostic value and replaces no medical or psychological advice. A success or a failure says nothing about you; only repetition, over hundreds of attempts, makes it possible to observe a lasting gap from the line of chance. The Centre reads these series for its research on perceptibility, without ever drawing a conclusion about a person. The data kept are described in the privacy policy.