I once saw a cake decorated in this way on a cake group, only had a rectangular shape . I wanted to make a cake and I did it. The first one went a little crookedly. The second cake went a little better although not yet perfectly. I will keep practicing. In the middle of cake there are lemon sponge cakes, black velvet, lemon curd and apple mousse, vanilla and cinnamon cream. Decorated with buttercream.