This treble recorder is an example of understandable design. For various reasons it’s separated into three parts and has to be assembled before usage, but a consistent decrease in diameter and significantly differently sized joints for both ends leave no ambiguity about how it should be assembled.
On their own the parts are unbalanced with exposed unpolished joints. Assembling the instrument creates a balanced, visually consistent object, and a sturdy interference fit gives the user extra confidence that the device is ready for use.
This Icelandic bus timetable is an example of confusing design, due to the inconsistent usage of colour and direction. The grids of times must be read top to bottom then left to right, contrary to most western languages. The yellow blocks (expressing at what intervals between the given times each bus leaves) are not strongly associated with the durations above them, and from a distance, the pairs look much like times themselves.