Relativity can be explained with basic algebra using only 2 formulae (the one for gamma and the relativistic velocity combo formula). These construct a simple graphical building block that can be joined by light signals to graphically show how relativistic phenomena such as time dilation, simultaneity, the muon experiment, the twin paradox can be explained through simple algebra. There are no rotated frames here, only three types of lines v, v_t and v_h (half speed relativistic velocity), their reciprocals and their behavior when multiplied by Y (gamma). The math also avoids square roots and squares in the equations to make them work using simple addition and subtraction. There is no clock sync, only light signals and the assumption atomic clocks all run at the normal clock rate within their frames thanks to the principle of relativity. I have a bunch of useful forms of the two main equations but I don't notice any easy way to put subscripts and superscripts here.