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"Shell" is approx 9 to 11mm long. It seems as though it could be a caterpillar of sorts that drags its house ("shell") around with it. These are often seen hanging from a ceiling, watering can spout, leaf or some such handy place by a silken thread. When disturbed it will swing side-to-side, approximating a hanging leaflet, but with a little too much 'energy' to be entirely accurate. In order to do a 180 turn, the caterpillar disappears into the 'shell' and simply comes out the other end and crawls off. It may extend to about 4 or 6mm from the 'shell' when moving, and then shrinks its body, dragging the 'shell' up to its head.
Found in an indoor kitchen. Have seen them in gardens, hanging from various objects, both low (20cm above grade) and high, from 14th floor ceilings.