Icemaker and refrigerator

A refrigerator comprising:

• a storage chamber;
• a cooler configured to supply cold air;
• a first tray configured to form a first portion of each of a plurality of cells;
• and
• a second tray configured to be rotatable with respect to the first tray and to form a second portion of each of the plurality of cells, the first and second portions being configured to form a space in which liquid is phase-changed into ice, the second tray configured to move to a first position and a second position, the first position being a position where the first portion and the second portion are spaced from each other and the second position being a position where the first and second portions contact each other;
• a liquid supply is configured to supply liquid to the space when the second tray is provided at the first position;
• and
• at least one communication passage provided between adjacent cells wherein, when the second tray is moved to the second position, the plurality cells are isolated except through the communication passage.

An ice maker, comprising:

• a first tray having a first wall defining a first cavity and a second cavity;
• a second tray having a second wall defining a third cavity and a fourth cavity, wherein the second tray is configured to move with respect to the first tray to a first position and a second position;
• and
• a communication passage recessed in a surface of the second wall at a position between the third and fourth cavities, wherein:
• when the second tray is moved to the first position, the first and second walls contact except at a position where the communication passage is formed,
• when the second tray is moved to the first position, the first and second walls are spaced from each other, and
• the communication passage is configured to such that a supercooling effect occurring in the first cell is transferred through the communication passage to the second cell.