It is easy to make, even for children.
The inspiration is from a fb post from Bjørk on Clayborators.
Start with the inside of an egg tray or make a cone.
Begynd med det inderste fra en æggebakke.
Press the small clay balls onto the cone / Tryk de små lerkugler fast på keglen.
Let the tree dry a bit and remove the cone. It is easy.
Lad træet tørre en smule og fjern derefter keglen. Det er let.