These unusual thermometers contain colorful orbs which rise and fall to indicate the current temperature. Crafted of high quality glass and individually calibrated to achieve an accuracy of 2 degree, these thermometers are timeless works of art. The tag on the lowest sphere in the top group indicates the current temperature. Galileo Galilei (1564 - 1642) was an Italian physicist, mathematician, astronomer, and philosopher who played a major role in the Scientific Revolution. His findings provided the framework for Newton's laws of motion and Einstein's theory of relativity. His discovery that the density of a liquid changes in proportion to its temperature, inspired the invention and explains the accuracy of the "Galileo Thermometer". Additional Details ------------------------------ Bullet point: The Galileo Thermometer is an example of utilizing scientific principle to create a useful artistic piece for day-to-day use. Designed with different colored spheres of varying densities, the thermometer is able to tell the temperature accurately. Decorative functional thermometer is a great conversation piece perfect for the home or office Product description: These unusual thermometers contain colorful orbs which rise and fall to indicate the current temperature. Crafted of high quality glass and individually calibrated to achieve an accuracy of 2 degree, these thermometers are timeless works of art. The tag on the lowest sphere in the top group indicates the current temperature. Galileo Galilei (1564 - 1642) was an Italian physicist, mathematician, astronomer, and philosopher who played a major role in the Scientific Revolution. His findings provided the framework for Newton's laws of motion and Einstein's theory of relativity. His discovery that the density of a liquid changes in proportion to its temperature, inspired the invention and explains the accuracy of the "Galileo Thermometer".