A suction cup, also sometimes known as a sucker, is an object that uses negative fluid pressure of air or water to adhere to nonporous surfaces and in the process creates a partial vacuum. They exist both as artificially created devices, and as anatomical traits of some animals such as squid and octopuses.
The working face of the suction cup has a curved surface. When the center of the suction cup is pressed against a flat, non-porous surface, the volume of the space between the suction cup and the flat surface is reduced, which causes the fluid between the cup and the surface to be expelled past the rim of the circular cup. When the user ceases to apply physical pressure to the centre of the outside of the cup, the elastic substance of which the cup is made tends to resume its original, curved shape. Because most of the fluid has already been forced out of the inside of the cup, the cavity which tends to develop between the cup and the flat surface has little to no air or water in it, and therefore lacks pressure. The pressure difference between the atmosphere on the outside of the cup, and the low-pressure cavity on the inside of the cup, is what keeps the cup adhered to the surface.
The length of time for which the suction effect can be maintained depends mainly on how long it takes for fluid to leak back into the cavity between the cup and the surface, equalizing the pressure with the surrounding atmosphere. This depends on the porosity and flatness of the surface and the rim of the cup.
Artificial suction cups are believed to have first been used in the 3rd century, B.C., and were made out of gourds. They were used to suction “bad blood” from internal organs to the surface. Hippocrates is believed to have invented this procedure.

Hand Stitched Drawing on Teabag no.1etsy.com


The Doorway, 1879-80, James Abbott McNeill Whistler

still life - Pierre http://ift.tt/KKHvMp

Claudia Wieser
Untitled, 2013
Woven tapestry
220 x 290 cm

Kawabata Ryushi

Mari Andrews

Empress Maria Feodorovna commissioned a diadem from the famous Duval Brothers. The Empress wanted something that would remind of the Russian fields, and so the brothers created a diadem of oak and laurel leaves, bordered by sheaves of wheat.

Imogen Cunningham


Otto Eckmann, knotted carpet, 1900. Smyrna Teppichfabriken, Berlin. From: Deutsche Kunst und Dekoration. Via University of Heidelberg