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This article discusses the history and aesthetics of the keystones used in structural bridge building and architectural styles, with a focus on the symbolic aspects of the keystone shape. Topics include a description of how a keystone voussoir was inserted into an arch after preliminary wooden and stone projections had been used to support to the other stones during construction, the adoption of the notched top keystone shape as an icon for many commercial and corporate entities, and the various exhibits at science museums that present demonstrations of classical stone arch building.

The article focuses on the pieces of marbles at the Drayton House in Northamptonshire, England. The marbles is a collection of parts of long curved slabs almost six feet in length, pieces of marble frames, and pieces of curved cornice with carved decorative keystones. Examination of these pieces reveals that they could be remnants of a marble buffet room alongside of the dining room during the early-eighteenth century.

The article presents tips for using facade fragments as decoration tools inside the house. Ornamental building blocks such as terra-cotta keystones and marbles can be used as focal points inside and outside the house. Four vase-shaped limestone balusters can serve as legs for a glass-top coffee table. A single scrolling keystone can be reinstalled over a front door.

Evaluates products and equipment used in the landscaping industry. HS-500 pull hydroseeding unit from Turbo Technologies; Keystone Country Manor from RCP Block & Brick Inc.; Express Blower from Jet Mulch Co.; SaiCoir from Sai International Trading Corp.

The article offers brief information on the Keystone Verazzo Stone™ from Keystone Retaining Walls Systems Inc.

The article presents information on Casio Inc.'s XJ-450 projector. It projects a huge 7.62m image at 2,800 ANSI lumens, bright enough for use with the lights on. HTPC-and HDTV-ready, with good colour and contrast, power focus and zoom, auto digital keystone correction and reasonably quiet operation at 33dB.