What your
recipient sees.
Tap the envelope. Then tap a card to turn it over.
Tap to open
The app's own drawing, moved.
Every layer above is a transparent picture the app rendered. This page moves them and draws nothing.
The app's timing
2600 ms, three overlapping beats, read from the app rather than tuned here.
The app's geometry
The app says where the wax goes. This page reads it.
A demonstration
Sending a link that opens somebody's own is next.