Same as Figure 8. A series of illusions created when a simple glass tube (tip of Pasteur pipette sloping down slightly to right) is viewed with light microscopy under varying conditions: (A) bright field compound scope @100×, substage condenser up; (B) same as A but condenser down; (C) same as A but stronger light; (D) same as A but phase contrast; (E) same tube but under a dissecting scope @40× and substage mirror at 45°; (F) is a drawing of the actual situation used to generate images A–E, with the gray bar in F representing the exact position of the compositional boundaries that generated A–E.