There's only one Vlinder
Vlinder is an app that makes your device part of a network through which a single Vlinder can fly. The Vlinder is only at one device at a time.
When Vlinder flies to your device you'll receive a notification and you can see it in your surrounding. It will then fly to the next closest connected device, ad infinitum.
See where Vlinder is right now. Or look at screenshots of Vlinder on its Facebook page.
The app is available for free.