| 摘要 |
<p>A structural element comprises a groove formed in a sheet of foldable material. The groove substantially defines a fold line along which the sheet of material is foldable. At least one tab and at least one recess may be formed in the groove. The tab may be positioned on a side of the groove opposite the recess. The tab and recess may be oriented such that the tab is receivable within the recess positioned on an opposite side of the groove. The tab and recess may form an internal finger joint when the material is folded along the fold line.</p> |
