C01 · Complete teaching source

Invented display record: A round paper badge has a narrow striped rim and a square hole in its centre. A plain round badge beside it has no centre hole. Neither badge has an owner label.

Child invitation

Help someone find the badge with the hole. Which words would you use?

Staff possible reasoning

The round badge with the square centre hole distinguishes the chosen drawing. The striped rim adds another recorded detail.

Next teaching

Hide the model wording, reread the two descriptions and ask which detail would still separate them if the stripes were covered.

Limit

A hole or stripe does not identify an owner or a real material strength.