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Gobos control light by blocking, coloring, or diffusing some portion of the beam before it reaches the lens. Because the light is shaped before it is focused, hard edged images can be projected over short distances. Most ellipsoidal reflector spotlights (ERS) have moveable lenses to allow sharp or soft focusing.

Fun science experiments for amateur scientists and schools, such as a glass-sphere microscope, a telescope, a sidereal indicator, a stereoscope, a herbarium, a stereoscopic microscope, experiments in electrochemistry, lexical analysis of texts, environmental exploration, panoramic pictures, observation of protists and other microorganisms, as well as links to other amateur sites.

Contains the entire v3.5 d20 System Reference Document and is fully indexed, hyperlinked, searchable, and accessible.