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Selection: S.sel stays the object picked last; S.selIds holds everything selected. - In the object list, Ctrl+click adds or removes an object and Shift+click selects a range. - On the map, Ctrl/Shift+click toggles an object and Shift+drag draws a box that selects what lies wholly inside it (locked and hidden objects are left out). - Ctrl+A selects everything that is not locked; Esc selects nothing. - Clicking a wall or fence a second time selects every piece of the same type joined to it; another click goes back to that one piece. - Dragging one selected object moves them all, together with the windows and doors on them, as one undo step. Arrow keys, R (turns the group about its middle), Ctrl+D, Delete, Lock and Hide all work on the whole selection. - When all selected objects share a type, the property form edits them all; fields where they differ show "mixed". - The agent's system prompt lists the selected objects. The viewer outlines several objects with selectObj([ids]) and passes the click event to onPick. A batch op now answers `ids`, one per operation, so the copies from a group duplicate get selected. Pond (Nature): natural, round or square, with a stone or grass edge, fish, lily pads, spreading ripples and reed clumps. The fish come from a new Swim primitive (script: s.swim). One matrix maps the object's frame to the screen. Each fish turns round its ellipse with a CSS rotation, so off-screen pausing and reduced motion apply as for the other animations. The house demo gets a koi pond in the back garden. Tests: ponds in every shape and rotation have the right number of fish, no NaN and no depth-sort cycles, and stay inside their rectangle. check_studio covers list and map multi-select, a group drag undone in one step, joined-fence selection, a mixed-value form applied to all, box select, delete and undo, Ctrl+A, Esc, and a new pond's fish.