yoko ono is a brilliant installation artist. she currently has an exhibition to the light at the serpentine gallery which i really recommend and it's free (and while you're there see the wonderful pavilion this summer). she is a very uncynical person and her work is laced with hope, imagination and a yearning for a better world. she's a romantic in the best sense i think. oustide the gallery are some wish trees – could be prayer trees i guess. take a label and write a wish. i found it very interesting to see what people wish for…