By inspecting multiple closely spaced slices, the machine can build up a three-dimensional picture of the patient's insides.

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The result, when fed into a computer, is a 17-dimensional picture of whatever scent is blowing over these sensors.

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The specimen is then rotated on a mechanised platform as it is exposed to the X-ray beam, in order to build up a three-dimensional picture.

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Cubists focused on the two dimensional picture plane, attempting visual deception by combining geometric shapes to portray real objects, oft incorporating fragments of reproduced pop culture.

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It is able, from the delay between the broadcast of a pulse and its reception in different places, and the strengths of the echoes, to draw a three-dimensional picture of what lies under the ground.

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The two-dimensional equivalent is known as Penrose tiling (see picture above), after Sir Roger Penrose, the mathematician who put this form of geometry on a formal footing.

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The use of either two-dimensional (2D) or three-dimensional (3D) ultrasound to only view the fetus, obtain a picture of the fetus or determine the fetal gender without a medical indication is inappropriate and contrary to responsible medical practice.

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Picture what it would be like to roll a bowling ball onto the two-dimensional surface of a trampoline.

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