Information holding method

1. An information holding method comprising:

defining a plurality of consecutive blocks that evenly section a sheet material; and

holding predetermined information expressed in the whole area of the sheet material by a combination of the presence/absence of information in each of the blocks, wherein

the presence/absence of information in the blocks includes the presence/absence of a magnetic material which generates a pulse-like response signal by applying an alternating field.

2. The information holding method according to claim 1 , wherein the sheet material includes a recording paper embedded the with linear magnetic material in each of the blocks.

3. The information holding method according to claim 1 , wherein a pattern formed on the sheet material by blocks having information, is a pattern according to information held in the sheet material.

4. The information holding method according to claim 3 , wherein a pattern which coincides with the pattern when rotated around a central point of the sheet material, expresses the same information as that of the pattern.

5. The information holding method according to claim 3 , wherein when the sheet material is formed in a rectangular shape, a mirror image with respect to a mirror surface along one side of the pattern, expresses the same information as that of the pattern.

6. A method of forming an information holding sheet material comprising:

defining on a sheet material a plurality of consecutive blocks that evenly section the sheet material; and

embedding a magnetic material in each of the plurality of consecutive blocks so that predetermined information is expressed in the whole area of the sheet material by a combination of the presence/absence of information for each of the blocks, wherein

the presence/absence of information in the blocks includes the presence/absence of a magnetic material which generates a pulse-like response signal by applying an alternating field.

7. The information holding method according to claim 1 , wherein

each block has a same length and a same width, and

each block has at least a length side adjoining a length side of a first adjoining block, and at least a width side adjoining a width side of a second adjoining block, different from the first adjoining block.

8. The method according to claim 6 , wherein

each block has a same length and a same width, and

each block has at least a length side adjoining a length side of a first adjoining block, and at least a width side adjoining a width side of a second adjoining block, different from the first adjoining block.