"Street Art" (Literally) on Colina Mews

On my way between the Massive Jumble and the Organ Factory Cinema this afternoon (more of both soon), I found my first graffiti/ street art fashioned from dirt. Wossit mean?

"Knowing" on Colina Mews

And just beyond was this. Am I puerile to want to know the meaning behind them?

"With Each of You" on Colina Mews