I know statues, and walls block movement. I know chairs don't. Do chairs slow dwarves down? What about other things? Armor stands, cabinets, etc?!
1 Answer
Very few buildable things in Dwarf Fortress block movement. As you witnessed yourself, Tables and chairs are casually ignored. There are two principle items that block movement (nothing slows movement, unless the dwarf is carrying something particularly heavy, like an elephant cage)
Constructions -- specifically walls. Dwarves can't go through walls, natural or constructed (duh!). Also included in this category are Flood Gates, Bars (horizontal or vertical, for their respective directions), raised bridges, and locked doors / hatches. Statues, windows, etc.
Workshops -- The specifics of which workshops block which spaces varies greatly based on the workshop itself. Do mind the jeweler's workshop, one of the few workshops to block the three leftmost squares of the workshop's 3x3 grid; more than one dwarven overseer has accidentally locked their poor jeweldwarves inside 3x3 rooms when they arrived to construct the workshop.
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Also, among the furniture, constructed slabs and statues (you can build statues around the map edge to stop all spawns on the surface, including caravans, and with the possible exception of fliers - not sure, they might spawn on the ground and then fly up.)– LizCommented Jun 4, 2018 at 10:10