Folded architectural panel

A folded architectural panel folded from a flat sheet, the panel having opposite first and second longitudinal ends extending in a width direction, opposite first and second lateral sides extending in a length direction and a depth perpendicular to the width and length directions, the panel including:

• a first end fold along a first end fold-line adjacent the first longitudinal end, extending in the width direction, and having opposite fold ends at the respective first and second lateral sides of the panel;
• a second end fold along a second end fold-line adjacent the second longitudinal end, extending in the width direction, and having opposite fold ends at the respective first and second lateral sides of the panel;
• and
• a main wall extending between the first end fold-line and the second end fold-line through an intermediate portion of the panel;
• wherein the first end fold-line and the second end fold-line are configured to enable, with contraction of the first and second end fold-lines towards each other, the main wall to pivot about the first end fold-line, to pivot about the second end fold-line and to form an arc with an increase in the depth of the panel at the intermediate portion;
• and
• wherein the panel further includes a curved first side fold along a respective curved first side fold-line extending between the respective fold ends at the first lateral side of the first and second end fold-lines and a curved second side fold along a respective curved second side fold-line not connecting with the first side fold-line and extending between the respective fold ends at the second lateral side of the first and second end fold-lines such that, as a consequence of the contraction of the first and second end fold-lines towards each other, a respective section of the first lateral side between the two respective fold ends is contracted inwardly towards a respective section of the second lateral side between the two respective fold ends and a respective sidewall is formed on each of the respective first and second lateral sides of the panel extending from the first and second side folds respectively in the depth direction.