This video says about itself:
Piet Mondrian – A Journey Through Modern Art.
Music by Philip Glass from “Glassworks” Track 6 – Closing (Instrumental).
Mondriaan wrote about 1,500 letters and 125 theoretical writings.
From the NRC article:
Assistant Curator Wietse Coppes, involved in the project as a Mondriaan expert, suspect that the letters will adjust the image of Mondriaan as severe person.
“His letters indeed show his frivolous side. Mondriaan was a good cook and loved vegetarian food, he was a gifted dancer and a big music lover.”