| 摘要 |
PROBLEM TO BE SOLVED: To provide a comfortable feeling by applying a one-point mark in the middle of the height of a rectangular grain-patterned thick plate having four R-shaped corners and arranging a narrow groove on the inside of the three side circumferences on the surface. SOLUTION: In a rectangular grain-patterned thick plate 1 having four R-shaped corners 1a, a one-point mark 2 is formed by burying a dowel 5 in the center of the height on the front face, while on the inside of the three side circumferences except for the front side on the surface, a narrow groove 3 is arranged around, and a space groove 4 is arranged in the middle of the narrow groove 3. If the one-point mark 2 and the navel position of a user are deflected vertically from each other, it means that the user's posture is not right, and the user is advised to correct his/her posture. The narrow groove 3 arranged on the inside in three side circumferences prevents a writing tool such as a pencil and a ball-point pen placed on the desk from dropping and serves as a groove for stably holding them. As the space groove 4 is arranged in the middle of the narrow groove 3, an eraser or a pen stand and the like can be stably placed in the space groove 4. Because the rectangular grain-patterned thick plate with R-shaped four corners is used, a natural feeling gentle to a user can be provided.
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