Any idea what these are for?

Any idea what these are for?
Any idea what these are for?
Updates
1 y
media.gettyimages.com/.../...-in-the-1960s-and.jpg

"In 1965 Eastman Kodak replaced the individual flashbulb technology used on early Instamatic cameras with the Flashcube developed by Sylvania Electric Products. A flashcube was a module with four expendable flashbulbs, each mounted at 90° from the others in its own reflector."
Updates
1 y
The cube snapped onto the camera. When you took a photo, the camera would automatically rotate the cube 90° to be ready for another photo.
After you used up all 4 flash bulbs in the cube, you removed it and snapped on another one.

It was like a semiautomatic flash clip.
Any idea what these are for?
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