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Scratchboard or scraperboard or scratch art [1] is a form of direct engraving where the artist scratches off dark ink to reveal a white or colored layer beneath. The technique uses sharp knives and tools for engraving into the scratchboard, which is usually cardboard covered in a thin layer of white China clay coated with black India ink .
Lacking a central pole, an open well staircase is supported at its outer periphery, or in some cases may be a completely self-supporting and free-standing structure. An example of perimeter support is the Vatican stairwell or the Gothic stairwell. The latter stairwell is tight because of its location where the diameter must be small.
The term sgraffito is based on the verb graffiare 'to scratch', which probably entered Italian through Lombardic and ultimately traces back to the Greek word gráphein 'to write'. The Italian prefix 's-' originates in the Latin prefix 'ex-', and is used in this case to intensify the basic meaning, so that 'to scratch' becomes 'to scratch off'.
This is a list of tallest freestanding structures in the world past and present. To be freestanding a structure must not be supported by guy wires , the sea or other types of auxiliary support. It therefore does not include guyed masts , partially guyed towers and drilling platforms but does include towers , skyscrapers ( pinnacle height) and ...
The sanctuary in all Indian religious structures, even free-standing ones, was designed to have the same cave-like feeling, as it is generally small and dark, without natural light. [5] The oldest rock-cut architecture is found in the Barabar caves , Bihar , which were built around the 3rd century BC.
Rebar is added for strength, to make a wall that is approximately half reinforced concrete and half stonework. The wall can be faced with stone on one side or both sides. After the concrete sets enough to hold the wall together, the forms are "slipped" up to pour the next level. With slipforms it is easy for a novice to build free-standing ...
The 16th Avenue Tiled Steps, colloquially known as the Moraga Steps, is a stairway in the Golden Gate Heights neighborhood in San Francisco, California. Fodor's calls it "possibly the world's largest mosaic staircase", [3] and it leads up to Grandview Park. The flight contains 163 steps stretching 90 feet (27 m) high.
(formerly Build Your Own Blocks) is a free block-based educational graphical programming language and online community. Snap allows students to explore, create, and remix interactive animations, games, stories, and more, while learning about mathematical and computational ideas. While inspired by Scratch, Snap! has many