Make your own tablets:

Any cardboard with a smouth and even surface can be used. Here I have taken two milk containers, but a set of playing cards could serve the purpose as well.
Furthermore you will need a marker,  scissors and a ruler.

Cut up the containers and cut out squares of 6 cm  X 6 cm.

When You have 12 squares of cardboard it is time for cutting holes.

Place the holes in the middle of the corners of the tablets – if I place the tablet 1 mm outside the side edge of my cutter it places the hole at the right place.

Now we are ready the make the warp.