Pumpkin Chocolate Mousse Cake

I dreamt I went to an interactive food museum on vacation to Germany and joined a guided tour. When we got to the dessert room, the guide pulled out a slab of what I guess was cake, but a lot shorter. The cake had pumpkin mousse layered on top of chocolate mousse with a chocolate cake base. It was really good. Realistically I'll probably never get around to making it but if anyone wants to try feel free.