Algodoo

Operator changes the Object: insert a circle into the slot on the top of the operator. Watch the process. Repeat with circles of other size and color.

Operator verändert das Objekt: lasse einen Kreis oben in den Eingang des Operators fallen und beobachte, was passiert. Wiederhole das mit Kreisen anderer Größe und Farbe.

coding: is done by usage of the script in onCollide, there

Scene.addBox({
pos := e.pos - (0, 0);
size := [1.77 * e.other.radius, 1.77 * e.other.radius];
vel := [0, 0.1];
color := e.other.color;
collideset := 2
});
e.other.density = 0

If you wish to help coding, and if you have time, then you might add an option-menue to select into which other kind of object the original circle will be transformed, or allow other types of object to be inserted into the slot.