Heptorectangles

It all started with a bad purchase. I wanted to buy dominoes to make polydominoes but at home I noticed the wrong side-to-side ratio. Therefore I decided to look for a construction with polyrectangles. There are 207 pieces of order 7 which can be packed in two 21x17 rectangles and one 21x35 rectangle.
The rectangles are displayed between two acrylic panes in a frame and the three parts are connected through hinges. So you can open and close the whole construction and let the sun light up the pieces from the back.

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