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Fortuna
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Fortuna is an esoteric programming language inspired by Brainfuck. Its mechanisms are based around the idea of a wheel, making Fortuna a turning tarpit.
Fortuna is a language in which there is a theoretical wheel, spinning at a constant speed of 1, that manipulates a set of bits. On this wheel there are five commands:
0 Switch current bit's value 1 Move bit pointer in current direction 2 Scan (searches in current direction for a scan in the opposite direction with wheel spinning, but not executing anything except directional changes, and not changing the direction of the search) 3 I/O out (right) in (left) big-endian storage 4 Switch direction of wheel
Scans can be nested. The actual code is expressed in 0's and 1's:
0 Change nothing 1 Take hand on or off the wheel
The language starts with hand off and going right. This program outputs a beep (the bell character, ASCII code 7):
01100011 00011000 11001010 01010010 10011001 00110001 10001100 01100011 00011000 11001100