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Jazz festivals --- Posters --- Belgium --- 21st century

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Suicidal behavior. --- History of medicine --- Klinische psychologie --- Psychiatry, psychology --- 21st century --- Belgium --- Flanders --- specifieke problemen --- Psychiatry, psychology. --- 21st century. --- Flanders. --- specifieke problemen. --- Specifieke problemen.

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Insects. Springtails --- Entomologie --- Entomology --- Auxiliary works --- History of medicine --- History of natural sciences --- Dictionaries, encyclopedias, glossaries --- 21st century --- Australia --- North America --- Physics, chemistry, biology --- Dictionaries, encyclopedias, glossaries. --- 21st century. --- Australia. --- North America. --- Physics, chemistry, biology.

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Explores how still-life paintings can look three-dimensional, how open doors can lead nowhere, and how other optical illusions are created in paintings by artists ranging from Raphael to Escher.

Optical illusions in art --- Visual perception --- Art appreciation. --- Optical illusions. --- Visual perception. --- History of medicine --- Internal medicine --- Medicine and arts --- Medicine and society --- Ophthalmology --- 21st century --- Psychiatry, psychology --- Medicine and arts. --- Medicine and society. --- Ophthalmology. --- 21st century. --- Psychiatry, psychology. --- gezichtsbedrog --- waarneming --- perception --- Iconography

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Deals with the logic of toll-free services in all three sectors: government, business and nonprofit, and generalizes the notion of voluntary work towards everthing that is free of charge.

Nonprofit organizations. --- Management --- Business & Economics --- Industrial Management --- Corporations, Nonprofit --- Non-profit organizations --- Non-profit sector --- Non-profits --- Nonprofit sector --- Nonprofits --- Not-for-profit organizations --- NPOs --- Organizations, Nonprofit --- Tax-exempt organizations --- Associations, institutions, etc. --- 21st century. --- Economic sociology, Political economy.