| Title | Optimistic Box No. 1 |
| View | box lid closed |
| Artist | Robert Filliou |
| Date | 1968 |
| Institution | Walker Art Center |
| Image | Courtesy Walker Art Center |
| Title | Optimistic Box No. 1 |
| View | box lid opened |
| Artist | Robert Filliou |
| Date | 1968 |
| Institution | Walker Art Center |
| Image | Courtesy Walker Art Center |