Réalisation - A rainbow in your room

Etape 1

Cut out cardboard partas to match your bedroom window.

In the lower part of a cardboard, cut a slot about 4 cm high and 1 cm wide.

Darken the room by fixing the cardboard on the window with adhesive tape (if there is another window in the room, close its blind or shutters).

Etape 2

Fill the freezer bag halfway with water and close it tightly.

Tape the bag so that the water surface is at the bottom of the slot, but not below.