<span>Installation art is a type of artwork that conceives of a space and everything in it. It is three-dimensional, and is created and designed to challenge one's perspective and perception of space.</span>
<span>Pointed arch, steel frame construction, frame construction
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Scientific theories are testable and make falsifiable predictions. They describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe or specific areas of inquiry (for example, electricity, chemistry, and astronomy).
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On May 3, these Spanish freedom fighters were rounded up and massacred by the French. Their blood literally ran through the streets of Madrid.
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