This envelope packing is using tracing paper as materials just like my small square book design. Because of tracing paper you can look through the beautiful postcard inside the envelope. A clever idea.
Wagashi (tea confectionery) made to represent spring water and sakura (cherry) blossoms. The artist is trying to give you the "feeling" you might have if you were watching blossoms floating in the fresh spring water as you sip your tea.