I just uploaded a new version of our modelling & drawing tool SimSketch. In the new version, I added one conceptually new feature: The distribution of elements before simulating. Using the “distribute” icon, you can create copies of an element before starting the simulation; which is particularly useful when you want to population your simulation world without using the “split” behavior (which would never stop creating copies…).
I used this feature to to create a sketched model of the famous Higgs field interpretation with Margaret Thatcher visiting a cocktail party. Go to the menu, chose “Examples – Higgs interpretation example”. When running, you should activate the “wrapping” feature to have particles that left the screen reappear on the other side again.