Shadow Drawing
Stand a toy in the sun and draw around its shadow.
Coloured water in a spray bottle and a garden full of blank canvas.
The best possible use of a snow day, and it needs food colouring and an old bottle.
Squeezing a spray trigger repeatedly is excellent hand strength work, and children do far more of it when the result is this immediate. Working at this scale also uses the whole arm rather than the fingers.
Warm clothes and a time limit. Food colouring stains clothing, so use old coats.
It melts.
Stand a toy in the sun and draw around its shadow.
A bucket of water, a decorating brush, and a whole wall to paint.
Old pans, a bucket of soil, some water, and no rules at all.
Tape a huge sheet of paper to the floor and let them draw on their hands and knees.
Wellies on, stick in hand, and every puddle on the street measured.
Branches, a sheet, and a structure that has to actually stand up.