  We present a graphical interface designed to demonstrate the techniques of
radio interferometry used by telescopes like ALMA, e-Merlin, the JVLA and SKA,
in a manner accessible to the general public. Interferometry is an
observational tech- nique used by astronomers to combine the signal from a few
to tens to hundreds of individual small antennas to achieve high resolution
images at radio and millimetre wavelengths. This graphical interface
demonstrates how the number of antenna, their position relative to one another
and the rotation of the Earth allow astronomers to create highly detailed
images at long wavelengths.
