What you are building · four activities, ages four to six

Looking properly

Looking is a skill and it can be practised. A four year old glances; the same child two months later will pick up two identical-looking pots, weigh them in each hand, and say which is heavier. What changes that is work where the difference is real but small enough to be missed at a glance, and where noticing it is what moves the activity forward.

What makes a difference worth noticing

The useful range is narrow. A difference that is obvious teaches nothing, and one that is invisible is just frustrating. Weighted Pod Sorting works because two identical pots holding slightly different amounts of rice sit exactly in that band: you can feel it, but only if you stop and attend to it.

Observation over time is the other half, and it is rarer. Plant Care and Growth Measuring asks a child to notice a change that is too slow to see, which is only possible by recording it. The paper strip with yesterday's mark on it is what makes the growth visible, and learning that a record can show you something your eyes cannot is a genuinely big idea at six.

Curiosity itself is mostly a matter of what gets answered. A child who asks why the shadow is a rectangle and gets a torch handed to them asks the next question. The most productive answer to most of these is here, try it.

What it looks like at each age

At four

Notices differences in one property at a time, and needs the two things side by side. Will sort by colour easily and by weight only with prompting.

Put the pair in their hands rather than on the table. Comparing needs both at once.

At five

Holds a question across a few minutes and starts to test it: turning a solid to see whether the shadow changes.

Say you do not know and suggest finding out. It is usually true and it is the best available answer.

At six

Will keep a record across days, and will notice when today's measurement breaks the pattern.

Give them somewhere to put the numbers. A strip of paper on the wall does more than a notebook in a drawer.

What is worth doing this week

Take something the child sees every day and put it next to a near-identical version. Two leaves from the same tree, two pebbles, two spoons. The whole activity is the sentence what is different about these.

Then start one record that runs for a fortnight. A mark on a paper strip each morning, dated, and nothing else. What it shows at the end is the point, and it cannot be hurried.

The activities on this shelf

Each of these turns on a difference small enough that it has to be looked for.

Two of the four are about noticing change over time, which is the rarer and more valuable half of this.

Nearby shelves

Close observation feeds problem solving, and it is where the nature and science work starts.