Reversible seats. My favorite: New Orleans streetcar. 8-second video.
Japanese train version:
Public bench version:
Previously:
Nesting chairs - GIF
Human Hoist collapsible garage work chair
Automatic rising deck chair - GIF
"Chairless chair" wearable ergonomic mechatronic exoskeleton chair - GIF and video
table saw jig for scooping out chair seat
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