Blakley's secret sharing scheme is geometric in nature. The secret is a point in an mdimensional space. n shares are constructed with each share defining a hyperplane in this space. By finding the intersection of any m of these planes, the secret (or point of intersection) can be obtained. This scheme is not perfect, as the person with a share of the secret knows that the secret is a point on his hyperplane. Nevertheless, this scheme can be modified to achieve perfect security.
This is based on the scenario where two shares are required to recover the secret. A twodimensional plane is used as only two shares are required to recover the secret. The secret is a point in the plane. Each share is a line that passes through the point. If any two of the shares are put together, the point of intersection, which is the secret, can be easily derived.   _{Your Comment}