Little buttons, real quantum rules

The wooden frame, round viewing window, protected pointer and oversized buttons are a digital model for a future physical busy board. X flips a state, H changes its superposition, Z changes relative phase and Y rotates around a different axis. The displayed arrow is a 2D projection of the 3D Bloch vector, so distinct positions in depth can sometimes overlap.

Try it: press H, then Measure. Reset and try again. You may see 0 or 1, each with a 50% chance. Measurement updates the state to the outcome, so the result becomes certain until another gate changes it.

A simulation of ideal single-qubit gates and computational-basis measurement. No quantum hardware is used.