Most believable way to draw multiple tiles on top of each other

2018-02-02 21:23:11

I am terrible with graphic design but I'm trying to make a figure in Keynote where squares are drawn on top of each other to represent changes through time. The idea is to take one tile that represents "space" and then stack these on top of each other to represent "time".

I'm not sure which square in the "time" image to make transparent (top or bottom one?) or which ones (all?) should have dashed lines, etc. Could someone provide an example or tips on how to improve my figure?